.vscode/settings.json

@@ -1,6 +1,7 @@
 {
   "FSharp.suggestGitignore": false,
   "cSpell.words": [
+    "Ingestor",
     "useparagon"
   ]
 }

README.md

@@ -17,8 +17,6 @@ A application harness to explore using Paragon for integrations.
 .\scripts\setup-certs.ps1
 ```
 
-> **Run this from an elevated (Admin) PowerShell prompt.** `mkcert` needs admin rights to install the CA into the JDK system trust store. Without elevation the OS and browsers still trust the cert, but Java tools will reject it.
-
 This uses [mkcert](https://github.com/FiloSottile/mkcert) (installed automatically if missing). No hosts file entries needed — `*.paragonplayground.localhost` resolves to 127.0.0.1 natively.
 
 ### 2. Start infrastructure

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Endpoints/IntegrationEndpoints.cs

@@ -56,7 +56,7 @@ internal static class IntegrationEndpoints
     HttpContext context,
     OrganizationIntegrationRepository repo,
     UserCredentialRepository credRepo,
-    ParagonService paragon,
+    ParagonApiClient paragon,
     CancellationToken ct
   )
   {

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Endpoints/ParagonEndpoints.cs

@@ -16,7 +16,7 @@ internal static class ParagonEndpoints
 
   private static async Task<IResult> GenerateToken(
     HttpContext context,
-    ParagonService paragon,
+    ParagonApiClient paragon,
     UserCredentialRepository credRepo,
     CancellationToken ct
   )

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Endpoints/StorageEndpoints.cs

@@ -12,6 +12,34 @@ namespace ParagonPlayground.Api.Endpoints;
 
 internal static class StorageEndpoints
 {
+  private static readonly Action<ILogger, Exception?> LogWebhookTestPing =
+    LoggerMessage.Define(
+      LogLevel.Information,
+      new EventId(1, nameof(HandleParagonWebhook)),
+      "Received Paragon Webhook test/verification ping."
+    );
+
+  private static readonly Action<ILogger, string, Exception?> LogNoRootItemFoundWarning =
+    LoggerMessage.Define<string>(
+      LogLevel.Warning,
+      new EventId(2, nameof(HandleParagonWebhook)),
+      "No root item found in DB for syncId: {SyncId}"
+    );
+
+  private static readonly Action<ILogger, string, string?, string?, Exception?> LogSyncErrored =
+    LoggerMessage.Define<string, string?, string?>(
+      LogLevel.Error,
+      new EventId(3, nameof(HandleParagonWebhook)),
+      "Sync {SyncId} failed with code {Code}: {Message}"
+    );
+
+  private static readonly Action<ILogger, string, Exception?> LogUnhandledWebhookEvent =
+    LoggerMessage.Define<string>(
+      LogLevel.Information,
+      new EventId(4, nameof(HandleParagonWebhook)),
+      "Received unhandled Paragon event type: {Event}"
+    );
+
   internal static RouteGroupBuilder MapStorageEndpoints(this RouteGroupBuilder group)
   {
     _ = group.MapGet("/", ListItems);
@@ -20,10 +48,150 @@ internal static class StorageEndpoints
     _ = group.MapDelete("/{id}", DeleteItem);
     _ = group.MapGet("/{id}/download", GetDownloadUrls);
     _ = group.MapGet("/{id}/content", ProxyContent);
+    _ = group.MapPost("/synced-folders", CreateSyncedFolder);
+    _ = group.MapPost("/webhook/paragon", HandleParagonWebhook).AllowAnonymous();
     _ = group.RequireAuthorization();
     return group;
   }
 
+  private static async Task<IResult> HandleParagonWebhook(
+    ParagonWebhookPayload payload,
+    StorageItemRepository repo,
+    UserCredentialRepository credRepo,
+    ParagonApiClient paragon,
+    SyncHierarchyIngestor syncHierarchyIngestor,
+    ILoggerFactory loggerFactory,
+    CancellationToken ct
+  )
+  {
+    var logger = loggerFactory.CreateLogger("ParagonWebhook");
+
+    if (payload is null || string.IsNullOrEmpty(payload.SyncInstanceId) || payload.Event is "test" or "ping")
+    {
+      LogWebhookTestPing(logger, null);
+      return Results.Ok(new { status = "ok", message = "Webhook endpoint active" });
+    }
+
+    var rootItem = await repo.GetByManagedSyncIdAsync(payload.SyncInstanceId, ct);
+
+    if (rootItem is null)
+    {
+      LogNoRootItemFoundWarning(logger, payload.SyncInstanceId, null);
+      return Results.Ok(new { status = "ignored", reason = "Sync instance not tracked in app" });
+    }
+
+    var jwt = paragon.GenerateToken(rootItem.OrganizationId);
+
+    switch (payload.Event)
+    {
+      case "sync_complete":
+      case "record_created":
+      case "record_updated":
+        await syncHierarchyIngestor.IngestSyncRecordsAsync(jwt, payload.SyncInstanceId, rootItem, ct);
+        break;
+
+      case "record_deleted":
+        if (!string.IsNullOrEmpty(payload.Data?.RecordId))
+        {
+          await DeleteSyncedRecordAsync(payload.Data.RecordId, rootItem, repo, ct);
+        }
+        break;
+
+      case "sync_errored":
+        LogSyncErrored(logger, payload.SyncInstanceId, payload.Error?.Code, payload.Error?.Message, null);
+        break;
+
+      default:
+        LogUnhandledWebhookEvent(logger, payload.Event, null);
+        break;
+    }
+
+    return Results.Ok(new { status = "processed" });
+  }
+
+  private static async Task DeleteSyncedRecordAsync(
+    string recordId,
+    StorageItem rootItem,
+    StorageItemRepository repo,
+    CancellationToken ct
+  )
+  {
+    StorageItem? existing = null;
+
+    if (string.IsNullOrWhiteSpace(rootItem.ManagedSyncId) is false)
+    {
+      existing = await repo.GetByParagonRecordIdAsync(
+        rootItem.OrganizationId,
+        rootItem.ManagedSyncId,
+        recordId,
+        ct
+      );
+    }
+
+    existing ??= await repo.GetBySharePointDriveItemIdAsync(rootItem.OrganizationId, recordId, ct);
+
+    if (existing is not null)
+    {
+      await repo.DeleteAsync(existing.Id, ct);
+    }
+  }
+
+  private static async Task<IResult> CreateSyncedFolder(
+    CreateSyncedFolderRequest request,
+    HttpContext context,
+    StorageItemRepository repo,
+    UserCredentialRepository credRepo,
+    ParagonApiClient paragon,
+    CancellationToken ct
+  )
+  {
+    var user = context.GetUser();
+    var org = context.GetOrganization();
+
+    var credentials = await credRepo.GetByUserIdAsync(user.Id, ct);
+    var spCredential = credentials.FirstOrDefault(
+      c => c.IntegrationType.Equals("sharepoint", StringComparison.OrdinalIgnoreCase)
+    );
+
+    var jwt = paragon.GenerateToken(org.Id, spCredential?.CredentialId);
+
+    var folderName = await paragon.GetDriveItemNameAsync(
+      jwt,
+      spCredential?.CredentialId,
+      request.SharePointSiteId,
+      request.SharePointFolderId,
+      ct
+    );
+
+    var syncId = await paragon.EnableSyncAsync(
+      jwt,
+      spCredential?.CredentialId,
+      request.SharePointFolderId,
+      request.SharePointSiteId,
+      ct
+    );
+
+    var rootFolder = new StorageItem
+    {
+      Id = ObjectId.GenerateNewId().ToString(),
+      OrganizationId = org.Id,
+      Name = folderName,
+      IsFolder = true,
+      ParentId = request.ParentId,
+      IsManagedSync = true,
+      ManagedSyncId = syncId,
+      SharePointFolderId = request.SharePointFolderId,
+      SharePointSiteId = request.SharePointSiteId,
+      IsReadOnly = true,
+      CreatedByUserId = user.Id,
+      CreatedAt = DateTime.UtcNow
+    };
+
+    await repo.CreateAsync(rootFolder, ct);
+
+    return Results.Created($"/api/storage/{rootFolder.Id}", rootFolder);
+  }
+
   private static async Task<IResult> ListItems(
     string? parentId,
     HttpContext context,
@@ -44,19 +212,7 @@ internal static class StorageEndpoints
       users[uid] = u?.DisplayName ?? "Unknown";
     }
 
-    return Results.Ok(items.Select(i => new StorageItemResponse
-    {
-      Id = i.Id,
-      Name = i.Name,
-      IsFolder = i.IsFolder,
-      ParentId = i.ParentId,
-      ContentType = i.ContentType,
-      FileSize = i.FileSize,
-      SharePointWebUrl = i.SharePointWebUrl,
-      CreatedByUserId = i.CreatedByUserId,
-      CreatedByDisplayName = users.GetValueOrDefault(i.CreatedByUserId, "Unknown"),
-      CreatedAt = i.CreatedAt,
-    }));
+    return Results.Ok(items.Select(i => StorageItemResponse.From(i, users.GetValueOrDefault(i.CreatedByUserId, "Unknown"))));
   }
 
   private static async Task<IResult> CreateFolder(
@@ -87,16 +243,7 @@ internal static class StorageEndpoints
 
     await repo.CreateAsync(item, ct);
 
-    return Results.Created($"/api/storage/{item.Id}", new StorageItemResponse
-    {
-      Id = item.Id,
-      Name = item.Name,
-      IsFolder = true,
-      ParentId = item.ParentId,
-      CreatedByUserId = item.CreatedByUserId,
-      CreatedByDisplayName = user.DisplayName,
-      CreatedAt = item.CreatedAt,
-    });
+    return Results.Created($"/api/storage/{item.Id}", StorageItemResponse.From(item, user.DisplayName));
   }
 
   private static async Task<IResult> UploadFile(
@@ -104,7 +251,7 @@ internal static class StorageEndpoints
     StorageItemRepository storageRepo,
     UserCredentialRepository credRepo,
     OrganizationIntegrationRepository configRepo,
-    ParagonService paragon,
+    ParagonApiClient paragon,
     UserRepository userRepo,
     CancellationToken ct
   )
@@ -206,42 +353,71 @@ internal static class StorageEndpoints
 
     await storageRepo.CreateAsync(storageItem, ct);
 
-    return Results.Created($"/api/storage/{storageItem.Id}", new StorageItemResponse
-    {
-      Id = storageItem.Id,
-      Name = storageItem.Name,
-      IsFolder = false,
-      ParentId = storageItem.ParentId,
-      ContentType = storageItem.ContentType,
-      FileSize = storageItem.FileSize,
-      SharePointWebUrl = storageItem.SharePointWebUrl,
-      CreatedByUserId = storageItem.CreatedByUserId,
-      CreatedByDisplayName = user.DisplayName,
-      CreatedAt = storageItem.CreatedAt,
-    });
+    return Results.Created($"/api/storage/{storageItem.Id}", StorageItemResponse.From(storageItem, user.DisplayName));
   }
 
   private static async Task<IResult> DeleteItem(
     string id,
     HttpContext context,
     StorageItemRepository repo,
+    UserCredentialRepository credRepo,
+    ParagonApiClient paragon,
     CancellationToken ct
   )
   {
+    var user = context.GetUser();
     var org = context.GetOrganization();
-
     var item = await repo.GetByIdAsync(id, ct);
 
-    if (item is null || item.OrganizationId != org.Id)
+    if (item is null)
     {
-      return Results.Problem(detail: "Item not found", statusCode: StatusCodes.Status404NotFound);
+      return Results.NotFound();
+    }
+
+    if (item.IsReadOnly && !item.IsManagedSync)
+    {
+      return Results.Problem(detail: "Contents of a managed sync folder are read-only.", statusCode: StatusCodes.Status403Forbidden);
+    }
+
+    if (item.IsManagedSync && !string.IsNullOrEmpty(item.ManagedSyncId))
+    {
+      var credentials = await credRepo.GetByUserIdAsync(user.Id, ct);
+      var spCredential = credentials.FirstOrDefault(c => c.IntegrationType.Equals("sharepoint", StringComparison.OrdinalIgnoreCase));
+      var jwt = paragon.GenerateToken(org.Id, spCredential?.CredentialId);
+
+      await paragon.DeleteSyncAsync(jwt, item.ManagedSyncId, ct);
+
+      await DeleteFolderRecursiveAsync(item.Id, repo, ct);
+      return Results.NoContent();
     }
 
     await repo.DeleteAsync(id, ct);
-
     return Results.NoContent();
   }
 
+  private static async Task DeleteFolderRecursiveAsync(
+    string folderId,
+    StorageItemRepository repo,
+    CancellationToken ct
+  )
+  {
+    var children = await repo.GetChildrenAsync(folderId, ct);
+
+    foreach (var child in children)
+    {
+      if (child.IsFolder)
+      {
+        await DeleteFolderRecursiveAsync(child.Id, repo, ct);
+      }
+      else
+      {
+        await repo.DeleteAsync(child.Id, ct);
+      }
+    }
+
+    await repo.DeleteAsync(folderId, ct);
+  }
+
   private static async Task<IResult> GetDownloadUrls(
     string id,
     HttpContext context,
@@ -272,11 +448,10 @@ internal static class StorageEndpoints
     HttpContext context,
     StorageItemRepository storageRepo,
     UserCredentialRepository credRepo,
-    ParagonService paragon,
+    ParagonApiClient paragon,
     CancellationToken ct
   )
   {
-    var user = context.GetUser();
     var org = context.GetOrganization();
 
     var item = await storageRepo.GetByIdAsync(id, ct);
@@ -286,27 +461,6 @@ internal static class StorageEndpoints
       return Results.Problem(detail: "Item not found", statusCode: StatusCodes.Status404NotFound);
     }
 
-    if (string.IsNullOrEmpty(item.SharePointDriveItemId) || string.IsNullOrEmpty(item.SharePointSiteId))
-    {
-      return Results.Problem(
-        detail: "No SharePoint reference available for this file.",
-        statusCode: StatusCodes.Status400BadRequest
-      );
-    }
-
-    var credentials = await credRepo.GetByUserIdAsync(user.Id, ct);
-    var spCredential = credentials.FirstOrDefault(c =>
-      c.IntegrationType.Equals("sharepoint", StringComparison.OrdinalIgnoreCase)
-    );
-
-    if (spCredential is null)
-    {
-      return Results.Problem(
-        detail: "No SharePoint credential found.",
-        statusCode: StatusCodes.Status400BadRequest
-      );
-    }
-
     if (paragon.IsConfigured is false)
     {
       return Results.Problem(
@@ -315,14 +469,56 @@ internal static class StorageEndpoints
       );
     }
 
-    var jwt = paragon.GenerateToken(org.Id, spCredential.CredentialId);
-    var fileStream = await paragon.DownloadFileAsync(
-      jwt,
-      spCredential.CredentialId,
-      item.SharePointSiteId,
-      item.SharePointDriveItemId,
-      ct
-    );
+    Stream fileStream;
+
+    if (
+      string.IsNullOrWhiteSpace(item.ManagedSyncId) is false
+      && string.IsNullOrWhiteSpace(item.ParagonRecordId) is false
+    )
+    {
+      var jwt = paragon.GenerateToken(org.Id);
+
+      fileStream = await paragon.DownloadSyncedRecordContentAsync(
+        jwt,
+        item.ManagedSyncId,
+        item.ParagonRecordId,
+        ct
+      );
+    }
+    else
+    {
+      if (string.IsNullOrEmpty(item.SharePointDriveItemId) || string.IsNullOrEmpty(item.SharePointSiteId))
+      {
+        return Results.Problem(
+          detail: "No SharePoint reference available for this file.",
+          statusCode: StatusCodes.Status400BadRequest
+        );
+      }
+
+      var user = context.GetUser();
+      var credentials = await credRepo.GetByUserIdAsync(user.Id, ct);
+      var spCredential = credentials.FirstOrDefault(c =>
+        c.IntegrationType.Equals("sharepoint", StringComparison.OrdinalIgnoreCase)
+      );
+
+      if (spCredential is null)
+      {
+        return Results.Problem(
+          detail: "No SharePoint credential found.",
+          statusCode: StatusCodes.Status400BadRequest
+        );
+      }
+
+      var jwt = paragon.GenerateToken(org.Id, spCredential.CredentialId);
+
+      fileStream = await paragon.DownloadFileAsync(
+        jwt,
+        spCredential.CredentialId,
+        item.SharePointSiteId,
+        item.SharePointDriveItemId,
+        ct
+      );
+    }
 
     return Results.Stream(fileStream, item.ContentType ?? "application/octet-stream", item.Name);
   }

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Program.cs

@@ -28,7 +28,7 @@ builder.Services.AddSingleton<SessionRepository>();
 builder.Services.AddSingleton<StorageItemRepository>();
 builder.Services.AddSingleton<UserCredentialRepository>();
 builder.Services.AddSingleton<OrganizationIntegrationRepository>();
-builder.Services.AddSingleton<ParagonService>();
+builder.Services.AddSingleton<SyncHierarchyIngestor>();
 
 builder.Services.Configure<ParagonOptions>(builder.Configuration.GetSection(ParagonOptions.SectionName));
 

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Services/ParagonApiClient.cs

@@ -1,22 +1,145 @@
 using System.Net.Http.Headers;
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Security.Cryptography;
+using System.Text;
 using System.Text.Json;
 
 using Microsoft.Extensions.Options;
+using Microsoft.IdentityModel.Tokens;
 
 using ParagonPlayground.Api.Options;
+using ParagonPlayground.Domain.DTOs;
 
 namespace ParagonPlayground.Api.Services;
 
 internal sealed class ParagonApiClient
 {
+  private static readonly JsonSerializerOptions JsonOptions = new()
+  {
+    PropertyNameCaseInsensitive = true
+  };
   private readonly HttpClient _httpClient;
-  private readonly string _projectId;
+  private readonly string _signingKey;
+  public string ProjectId { get; }
 
   public ParagonApiClient(HttpClient httpClient, IOptions<ParagonOptions> options)
   {
     _httpClient = httpClient;
-    _projectId = options.Value.ProjectId;
-    _httpClient.BaseAddress = new Uri(options.Value.ProxyBaseUrl.TrimEnd('/') + "/");
+    var paragonOptions = options.Value;
+    ProjectId = paragonOptions.ProjectId;
+    _signingKey = paragonOptions.SigningKey;
+    _httpClient.BaseAddress = new Uri(paragonOptions.ProxyBaseUrl.TrimEnd('/') + "/");
+  }
+
+
+  public bool IsConfigured =>
+    string.IsNullOrEmpty(ProjectId) is false
+    && string.IsNullOrEmpty(_signingKey) is false;
+
+  public string GenerateToken(string organizationId, string? credentialId = null)
+  {
+    if (IsConfigured is false)
+    {
+      throw new InvalidOperationException("Paragon is not configured. Set Paragon:ProjectId and Paragon:SigningKey.");
+    }
+
+    using var rsa = RSA.Create();
+    rsa.ImportFromPem(_signingKey);
+
+    var key = new RsaSecurityKey(rsa.ExportParameters(true)) { KeyId = "paragon" };
+    var signingCredentials = new SigningCredentials(key, SecurityAlgorithms.RsaSha256);
+
+    var now = DateTime.UtcNow;
+
+    var permissions = credentialId is not null
+      ? new Dictionary<string, object>
+      {
+        ["integration:sharepoint"] = new Dictionary<string, object>
+        {
+          [$"credential:{credentialId}"] = true,
+        },
+      }
+      : (object)new Dictionary<string, object>
+      {
+        ["integration:sharepoint"] = new Dictionary<string, object>
+        {
+          ["credential:*"] = new[] { "credential:write" },
+        },
+      };
+
+    var claims = new[]
+    {
+      new Claim("sub", $"org:{organizationId}"),
+      new Claim("aud", $"useparagon.com/{ProjectId}"),
+      new Claim("urn:useparagon:connect:permissions", JsonSerializer.Serialize(permissions)),
+    };
+
+    var token = new JwtSecurityToken(
+      claims: claims,
+      notBefore: now,
+      expires: now.AddHours(1),
+      signingCredentials: signingCredentials
+    );
+
+    return new JwtSecurityTokenHandler().WriteToken(token);
+  }
+
+  public async Task<string> GetDriveItemNameAsync(
+    string jwt,
+    string? credentialId,
+    string siteId,
+    string folderId,
+    CancellationToken ct
+  )
+  {
+    var url = $"projects/{ProjectId}/sdk/proxy/sharepoint/sites/{siteId}/drive/items/{folderId}";
+
+    using var request = new HttpRequestMessage(HttpMethod.Get, url);
+    _ = request.Headers.TryAddWithoutValidation("Authorization", $"Bearer {jwt}");
+
+    if (string.IsNullOrEmpty(credentialId) is false)
+    {
+      _ = request.Headers.TryAddWithoutValidation("X-Paragon-Credential", credentialId);
+    }
+
+    using var response = await _httpClient.SendAsync(request, ct).ConfigureAwait(false);
+    _ = response.EnsureSuccessStatusCode();
+
+    var json = await response.Content.ReadAsStringAsync(ct).ConfigureAwait(false);
+    using var doc = JsonDocument.Parse(json);
+
+    if (doc.RootElement.TryGetProperty("output", out var output) && output.TryGetProperty("name", out var nameProp))
+    {
+      return nameProp.GetString() ?? "Synced SharePoint Folder";
+    }
+
+    return "Synced SharePoint Folder";
+  }
+
+  public async Task<SyncedRecordsResponse> PullSyncedRecordsAsync(
+    string jwt,
+    string syncId,
+    string? cursor,
+    int pageSize,
+    CancellationToken ct
+  )
+  {
+    var url = $"https://sync.useparagon.com/api/syncs/{syncId}/records?pageSize={pageSize}";
+
+    if (string.IsNullOrEmpty(cursor) is false)
+    {
+      url += $"&cursor={Uri.EscapeDataString(cursor)}";
+    }
+
+    using var request = new HttpRequestMessage(HttpMethod.Get, url);
+    request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", jwt);
+
+    using var response = await _httpClient.SendAsync(request, ct).ConfigureAwait(false);
+    _ = response.EnsureSuccessStatusCode();
+
+    var json = await response.Content.ReadAsStringAsync(ct).ConfigureAwait(false);
+    return JsonSerializer.Deserialize<SyncedRecordsResponse>(json, JsonOptions) ?? new SyncedRecordsResponse();
   }
 
   public async Task<string> UploadFileAsync(
@@ -30,7 +153,7 @@ internal sealed class ParagonApiClient
     CancellationToken ct
   )
   {
-    var url = $"projects/{_projectId}/sdk/proxy/sharepoint"
+    var url = $"projects/{ProjectId}/sdk/proxy/sharepoint"
       + $"/sites/{siteId}/drive/root:/{folderPath.Trim('/')}/{fileName}:/content";
 
     using var ms = new MemoryStream();
@@ -60,13 +183,31 @@ internal sealed class ParagonApiClient
     CancellationToken ct
   )
   {
-    var url = $"projects/{_projectId}/sdk/proxy/sharepoint"
+    var url = $"projects/{ProjectId}/sdk/proxy/sharepoint"
       + $"/sites/{siteId}/drive/items/{driveItemId}/content";
 
     using var request = new HttpRequestMessage(HttpMethod.Get, url);
 
     _ = request.Headers.TryAddWithoutValidation("Authorization", $"Bearer {jwt}");
     _ = request.Headers.TryAddWithoutValidation("X-Paragon-Credential", credentialId);
+    _ = request.Headers.TryAddWithoutValidation("X-Paragon-Use-Raw-Response", "1");
+
+    var response = await _httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, ct).ConfigureAwait(false);
+    _ = response.EnsureSuccessStatusCode();
+
+    return await response.Content.ReadAsStreamAsync(ct).ConfigureAwait(false);
+  }
+
+  public async Task<Stream> DownloadSyncedRecordContentAsync(
+    string jwt,
+    string syncId,
+    string recordId,
+    CancellationToken ct
+  )
+  {
+    var url = $"https://sync.useparagon.com/api/syncs/{syncId}/records/{recordId}/content";
+    using var request = new HttpRequestMessage(HttpMethod.Get, url);
+    request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", jwt);
 
     var response = await _httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, ct).ConfigureAwait(false);
     _ = response.EnsureSuccessStatusCode();
@@ -88,7 +229,7 @@ internal sealed class ParagonApiClient
       ? ":/" + string.Join("/", segments.Select(Uri.EscapeDataString))
       : "";
 
-    var proxyUrl = $"projects/{_projectId}/sdk/proxy/sharepoint/sites/{uri.Host}{encodedPath}";
+    var proxyUrl = $"projects/{ProjectId}/sdk/proxy/sharepoint/sites/{uri.Host}{encodedPath}";
 
     using var request = new HttpRequestMessage(HttpMethod.Get, proxyUrl);
     _ = request.Headers.TryAddWithoutValidation("Authorization", $"Bearer {jwt}");
@@ -104,4 +245,49 @@ internal sealed class ParagonApiClient
     var idProp = output.GetProperty("id");
     return idProp.GetString() ?? "";
   }
+
+  public async Task<string> EnableSyncAsync(
+    string jwt,
+    string? credentialId,
+    string folderId,
+    string siteId,
+    CancellationToken ct
+  )
+  {
+    var url = "https://sync.useparagon.com/api/syncs";
+    using var request = new HttpRequestMessage(HttpMethod.Post, url);
+
+    request.Headers.Authorization = new("Bearer", jwt);
+
+    var payload = new
+    {
+      integration = "sharepoint",
+      pipeline = "files",
+      credentialId,
+      configuration = new
+      {
+        folderId,
+        siteId,
+      },
+    };
+
+    request.Content = new StringContent(JsonSerializer.Serialize(payload), Encoding.UTF8, "application/json");
+
+    using var response = await _httpClient.SendAsync(request, ct).ConfigureAwait(false);
+    var json = await response.Content.ReadAsStringAsync(ct).ConfigureAwait(false);
+    _ = response.EnsureSuccessStatusCode();
+
+    using var doc = JsonDocument.Parse(json);
+    return doc.RootElement.GetProperty("id").GetString() ?? throw new InvalidOperationException("Failed to obtain sync ID");
+  }
+
+  public async Task DeleteSyncAsync(string jwt, string syncId, CancellationToken ct)
+  {
+    var url = $"https://sync.useparagon.com/api/syncs/{syncId}";
+    using var request = new HttpRequestMessage(HttpMethod.Delete, url);
+    request.Headers.Authorization = new("Bearer", jwt);
+
+    using var response = await _httpClient.SendAsync(request, ct).ConfigureAwait(false);
+    _ = response.EnsureSuccessStatusCode();
+  }
 }

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Services/ParagonService.cs

@@ -1,106 +0,0 @@
-using System.IdentityModel.Tokens.Jwt;
-using System.Security.Claims;
-using System.Security.Cryptography;
-using System.Text.Json;
-
-using Microsoft.Extensions.Options;
-using Microsoft.IdentityModel.Tokens;
-
-using ParagonPlayground.Api.Options;
-
-namespace ParagonPlayground.Api.Services;
-
-internal sealed class ParagonService(IOptions<ParagonOptions> options, ParagonApiClient apiClient)
-{
-  private readonly ParagonOptions _options = options.Value;
-  private readonly ParagonApiClient _apiClient = apiClient;
-
-  public string ProjectId => _options.ProjectId;
-
-  public bool IsConfigured =>
-    string.IsNullOrEmpty(_options.ProjectId) is false
-    && string.IsNullOrEmpty(_options.SigningKey) is false;
-
-  public string GenerateToken(string organizationId, string? credentialId = null)
-  {
-    if (IsConfigured is false)
-    {
-      throw new InvalidOperationException("Paragon is not configured. Set Paragon:ProjectId and Paragon:SigningKey.");
-    }
-
-    using var rsa = RSA.Create();
-    rsa.ImportFromPem(_options.SigningKey);
-
-    var key = new RsaSecurityKey(rsa.ExportParameters(true)) { KeyId = "paragon" };
-    var signingCredentials = new SigningCredentials(key, SecurityAlgorithms.RsaSha256);
-
-    var now = DateTime.UtcNow;
-
-    var permissions = credentialId is not null
-      ? new Dictionary<string, object>
-      {
-        ["integration:sharepoint"] = new Dictionary<string, object>
-        {
-          [$"credential:{credentialId}"] = true,
-        },
-      }
-      : (object)new Dictionary<string, object>
-      {
-        ["integration:sharepoint"] = new Dictionary<string, object>
-        {
-          ["credential:*"] = new[] { "credential:write" },
-        },
-      };
-
-    var claims = new[]
-    {
-      new Claim("sub", $"org:{organizationId}"),
-      new Claim("aud", $"useparagon.com/{_options.ProjectId}"),
-      new Claim("urn:useparagon:connect:permissions", JsonSerializer.Serialize(permissions)),
-    };
-
-    var token = new JwtSecurityToken(
-      claims: claims,
-      notBefore: now,
-      expires: now.AddHours(1),
-      signingCredentials: signingCredentials
-    );
-
-    return new JwtSecurityTokenHandler().WriteToken(token);
-  }
-
-  public Task<string> UploadFileAsync(
-    string jwt,
-    string credentialId,
-    string siteId,
-    string folderPath,
-    string fileName,
-    Stream fileStream,
-    string contentType,
-    CancellationToken ct
-  )
-  {
-    return _apiClient.UploadFileAsync(jwt, credentialId, siteId, folderPath, fileName, fileStream, contentType, ct);
-  }
-
-  public Task<string> ResolveSiteUrlAsync(
-    string jwt,
-    string credentialId,
-    string siteUrl,
-    CancellationToken ct
-  )
-  {
-    return _apiClient.ResolveSiteUrlAsync(jwt, credentialId, siteUrl, ct);
-  }
-
-  public Task<Stream> DownloadFileAsync(
-    string jwt,
-    string credentialId,
-    string siteId,
-    string driveItemId,
-    CancellationToken ct
-  )
-  {
-    return _apiClient.DownloadFileAsync(jwt, credentialId, siteId, driveItemId, ct);
-  }
-}

src/ParagonPlayground/backend/src/ParagonPlayground.Api/Services/SyncHierarchyIngestor.cs

@@ -0,0 +1,298 @@
+using MongoDB.Bson;
+
+using ParagonPlayground.Domain.DTOs;
+using ParagonPlayground.Domain.Entities;
+using ParagonPlayground.Infrastructure.Data;
+
+namespace ParagonPlayground.Api.Services;
+
+internal sealed class SyncHierarchyIngestor(StorageItemRepository repo, ParagonApiClient paragon)
+{
+  private readonly StorageItemRepository _repo = repo;
+  private readonly ParagonApiClient _paragon = paragon;
+
+  public async Task IngestSyncRecordsAsync(
+    string jwt,
+    string syncId,
+    StorageItem rootItem,
+    CancellationToken ct
+  )
+  {
+    var fetchedRecords = await FetchRecordsAsync(jwt, syncId, ct);
+    var normalizedRecords = NormalizeRecords(fetchedRecords, rootItem);
+
+    if (normalizedRecords.All.Count == 0)
+    {
+      return;
+    }
+
+    var existingState = await LoadExistingStateAsync(rootItem.OrganizationId, normalizedRecords.ExternalIds, ct);
+    var folderResult = await PersistFoldersAsync(rootItem, syncId, normalizedRecords.Folders, existingState, ct);
+    await PersistUnresolvedFoldersAtRootAsync(rootItem, syncId, folderResult.UnresolvedFolders, existingState, ct);
+    await PersistFilesAsync(rootItem, syncId, normalizedRecords.Files, folderResult.FolderStorageIdByExternalId, existingState, ct);
+  }
+
+  private async Task<IReadOnlyList<SyncedRecordItem>> FetchRecordsAsync(
+    string jwt,
+    string syncId,
+    CancellationToken ct
+  )
+  {
+    string? cursor = null;
+    var hasMore = true;
+    var records = new List<SyncedRecordItem>();
+
+    while (hasMore && !ct.IsCancellationRequested)
+    {
+      var response = await _paragon.PullSyncedRecordsAsync(jwt, syncId, cursor, 100, ct);
+      records.AddRange(response.Data);
+
+      cursor = response.Paging?.Cursor;
+      hasMore = (response.Paging?.RemainingRecords ?? 0) > 0 && !string.IsNullOrEmpty(cursor);
+    }
+
+    return records;
+  }
+
+  private static NormalizedRecordSet NormalizeRecords(
+    IReadOnlyList<SyncedRecordItem> records,
+    StorageItem rootItem
+  )
+  {
+    var all = records
+      .Where(r => string.IsNullOrWhiteSpace(r.ExternalId) is false)
+      .GroupBy(r => r.ExternalId, StringComparer.Ordinal)
+      .Select(g => g.Last())
+      .Where(r => IsRootRecord(r, rootItem) is false)
+      .ToList();
+
+    return new NormalizedRecordSet(
+      All: all,
+      Folders: [.. all.Where(r => r.IsFolder())],
+      Files: [.. all.Where(r => r.IsFolder() is false)],
+      ExternalIds: [.. all.Select(r => r.ExternalId).Distinct(StringComparer.Ordinal)]
+    );
+  }
+
+  private async Task<ExistingStorageState> LoadExistingStateAsync(
+    string organizationId,
+    IReadOnlyList<string> externalIds,
+    CancellationToken ct
+  )
+  {
+    var existingItems = await _repo.GetBySharePointDriveItemIdsAsync(organizationId, externalIds, ct);
+    return ExistingStorageState.FromItems(existingItems);
+  }
+
+  private async Task<FolderResolutionResult> PersistFoldersAsync(
+    StorageItem rootItem,
+    string syncId,
+    IReadOnlyList<SyncedRecordItem> folders,
+    ExistingStorageState state,
+    CancellationToken ct
+  )
+  {
+    var pending = folders.ToList();
+    var folderStorageIdByExternalId = new Dictionary<string, string>(state.FolderStorageIdByExternalId, StringComparer.Ordinal);
+
+    while (pending.Count > 0 && !ct.IsCancellationRequested)
+    {
+      var progressMade = false;
+      var nextPending = new List<SyncedRecordItem>();
+
+      foreach (var folder in pending)
+      {
+        if (TryResolveParentId(rootItem, folder, folderStorageIdByExternalId, out var parentId) is false)
+        {
+          nextPending.Add(folder);
+          continue;
+        }
+
+        var persisted = await UpsertStorageItemAsync(rootItem, syncId, folder, isFolder: true, parentId, state.ItemsByExternalId, ct);
+        folderStorageIdByExternalId[folder.ExternalId] = persisted.Id;
+        progressMade = true;
+      }
+
+      pending = nextPending;
+
+      if (progressMade is false)
+      {
+        break;
+      }
+    }
+
+    return new FolderResolutionResult(folderStorageIdByExternalId, pending);
+  }
+
+  private async Task PersistUnresolvedFoldersAtRootAsync(
+    StorageItem rootItem,
+    string syncId,
+    IReadOnlyList<SyncedRecordItem> unresolvedFolders,
+    ExistingStorageState state,
+    CancellationToken ct
+  )
+  {
+    foreach (var folder in unresolvedFolders)
+    {
+      var persisted = await UpsertStorageItemAsync(rootItem, syncId, folder, isFolder: true, rootItem.Id, state.ItemsByExternalId, ct);
+      state.FolderStorageIdByExternalId[folder.ExternalId] = persisted.Id;
+    }
+  }
+
+  private async Task PersistFilesAsync(
+    StorageItem rootItem,
+    string syncId,
+    IReadOnlyList<SyncedRecordItem> files,
+    Dictionary<string, string> folderStorageIdByExternalId,
+    ExistingStorageState state,
+    CancellationToken ct
+  )
+  {
+    foreach (var file in files)
+    {
+      var parentId = rootItem.Id;
+
+      if (
+        IsRootParent(rootItem, file) is false
+        && folderStorageIdByExternalId.TryGetValue(file.ParentFolderId, out var resolvedParentId)
+      )
+      {
+        parentId = resolvedParentId;
+      }
+
+      _ = await UpsertStorageItemAsync(rootItem, syncId, file, isFolder: false, parentId, state.ItemsByExternalId, ct);
+    }
+  }
+
+  private async Task<StorageItem> UpsertStorageItemAsync(
+    StorageItem rootItem,
+    string syncId,
+    SyncedRecordItem record,
+    bool isFolder,
+    string parentId,
+    Dictionary<string, StorageItem> itemsByExternalId,
+    CancellationToken ct
+  )
+  {
+    if (itemsByExternalId.TryGetValue(record.ExternalId, out var existing))
+    {
+      existing.Name = record.Name;
+      existing.IsFolder = isFolder;
+      existing.ParentId = parentId;
+      existing.ContentType = isFolder ? null : record.MimeType;
+      existing.FileSize = isFolder ? 0 : record.Size;
+      existing.SharePointSiteId = rootItem.SharePointSiteId;
+      existing.SharePointDriveItemId = record.ExternalId;
+      existing.SharePointWebUrl = record.Url;
+      existing.IsManagedSync = false;
+      existing.ManagedSyncId = syncId;
+      existing.ParagonRecordId = record.Id;
+      existing.IsReadOnly = true;
+
+      await _repo.UpdateAsync(existing, ct);
+      return existing;
+    }
+
+    var newItem = new StorageItem
+    {
+      Id = ObjectId.GenerateNewId().ToString(),
+      OrganizationId = rootItem.OrganizationId,
+      Name = record.Name,
+      IsFolder = isFolder,
+      ParentId = parentId,
+      ContentType = isFolder ? null : record.MimeType,
+      FileSize = isFolder ? 0 : record.Size,
+      SharePointSiteId = rootItem.SharePointSiteId,
+      SharePointDriveItemId = record.ExternalId,
+      SharePointWebUrl = record.Url,
+      IsManagedSync = false,
+      ManagedSyncId = syncId,
+      ParagonRecordId = record.Id,
+      IsReadOnly = true,
+      CreatedByUserId = rootItem.CreatedByUserId,
+      CreatedAt = DateTime.UtcNow
+    };
+
+    await _repo.CreateAsync(newItem, ct);
+    itemsByExternalId[record.ExternalId] = newItem;
+    return newItem;
+  }
+
+  private static bool TryResolveParentId(
+    StorageItem rootItem,
+    SyncedRecordItem record,
+    Dictionary<string, string> folderStorageIdByExternalId,
+    out string parentId
+  )
+  {
+    if (IsRootParent(rootItem, record))
+    {
+      parentId = rootItem.Id;
+      return true;
+    }
+
+    if (folderStorageIdByExternalId.TryGetValue(record.ParentFolderId, out var resolvedParentId))
+    {
+      parentId = resolvedParentId;
+      return true;
+    }
+
+    parentId = string.Empty;
+    return false;
+  }
+
+  private static bool IsRootRecord(SyncedRecordItem record, StorageItem rootItem)
+  {
+    return string.Equals(record.ExternalId, rootItem.SharePointFolderId, StringComparison.OrdinalIgnoreCase)
+      || string.Equals(record.ExternalId, rootItem.SharePointDriveItemId, StringComparison.OrdinalIgnoreCase);
+  }
+
+  private static bool IsRootParent(StorageItem rootItem, SyncedRecordItem record)
+  {
+    return string.IsNullOrWhiteSpace(record.ParentFolderId)
+      || string.Equals(record.ParentFolderId, rootItem.SharePointFolderId, StringComparison.OrdinalIgnoreCase)
+      || string.Equals(record.ParentFolderId, rootItem.SharePointDriveItemId, StringComparison.OrdinalIgnoreCase);
+  }
+
+  private sealed record NormalizedRecordSet(
+    IReadOnlyList<SyncedRecordItem> All,
+    IReadOnlyList<SyncedRecordItem> Folders,
+    IReadOnlyList<SyncedRecordItem> Files,
+    IReadOnlyList<string> ExternalIds
+  );
+
+  private sealed class ExistingStorageState
+  {
+    public Dictionary<string, StorageItem> ItemsByExternalId { get; }
+    public Dictionary<string, string> FolderStorageIdByExternalId { get; }
+
+    private ExistingStorageState(
+      Dictionary<string, StorageItem> itemsByExternalId,
+      Dictionary<string, string> folderStorageIdByExternalId
+    )
+    {
+      ItemsByExternalId = itemsByExternalId;
+      FolderStorageIdByExternalId = folderStorageIdByExternalId;
+    }
+
+    public static ExistingStorageState FromItems(IEnumerable<StorageItem> items)
+    {
+      var itemList = items.ToList();
+
+      var itemsByExternalId = itemList
+        .Where(i => string.IsNullOrWhiteSpace(i.SharePointDriveItemId) is false)
+        .ToDictionary(i => i.SharePointDriveItemId!, StringComparer.Ordinal);
+
+      var folderStorageIdByExternalId = itemList
+        .Where(i => i.IsFolder && string.IsNullOrWhiteSpace(i.SharePointDriveItemId) is false)
+        .ToDictionary(i => i.SharePointDriveItemId!, i => i.Id, StringComparer.Ordinal);
+
+      return new ExistingStorageState(itemsByExternalId, folderStorageIdByExternalId);
+    }
+  }
+
+  private sealed record FolderResolutionResult(
+    Dictionary<string, string> FolderStorageIdByExternalId,
+    IReadOnlyList<SyncedRecordItem> UnresolvedFolders
+  );
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Cli/Commands/SeedCommand.cs

@@ -12,9 +12,12 @@ namespace ParagonPlayground.Cli.Commands;
 internal class SeedCommand(
   OrganizationRepository orgRepo,
   UserRepository userRepo,
-  PasswordService passwordService) : AsyncCommand<SeedCommand.Settings>
+  PasswordService passwordService
+) : AsyncCommand<SeedCommand.Settings>
 {
-  internal class Settings : CommandSettings { }
+  internal class Settings : CommandSettings
+  {
+  }
 
   protected override async Task<int> ExecuteAsync(CommandContext context, Settings settings, CancellationToken cancellationToken)
   {

src/ParagonPlayground/backend/src/ParagonPlayground.Domain/DTOs/CreateSyncedFolderRequest.cs

@@ -0,0 +1,17 @@
+namespace ParagonPlayground.Domain.DTOs;
+
+/// <summary>Represents a request to sync a folder from a sharepoint site.</summary>
+public class CreateSyncedFolderRequest
+{
+  /// <summary>The sharepoint id for the folder that will be synced.</summary>
+  public required string SharePointFolderId { get; set; }
+
+  /// <summary>The id of the sharepoint site where the folder to be synced exists.</summary>
+  public required string SharePointSiteId { get; set; }
+
+  /// <summary>The id of the parent id for the folder being synced.</summary>
+  public string ParentId { get; set; } = string.Empty;
+
+  /// <summary>The associated credentials with the folder sync.</summary>
+  public string CredentialId { get; set; } = string.Empty;
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Domain/DTOs/ParagonWebhookPayload.cs

@@ -0,0 +1,60 @@
+namespace ParagonPlayground.Domain.DTOs;
+
+/// <summary>Webhook payload sent by Paragon for managed sync lifecycle events.</summary>
+public class ParagonWebhookPayload
+{
+
+  /// <summary>Webhook event type (for example: sync_complete, record_updated, record_deleted).</summary>
+  public string Event { get; set; } = string.Empty;
+
+  /// <summary>Paragon managed sync instance identifier associated with this event.</summary>
+  public string SyncInstanceId { get; set; } = string.Empty;
+
+  /// <summary>Sync descriptor from the webhook payload, when provided.</summary>
+  public string Sync { get; set; } = string.Empty;
+
+  /// <summary>Credential identifier used by the integration, when included by Paragon.</summary>
+  public string CredentialId { get; set; } = string.Empty;
+
+  /// <summary>User context attached to the webhook payload.</summary>
+  public ParagonWebhookUser? User { get; set; }
+
+  /// <summary>Event-specific data payload.</summary>
+  public ParagonWebhookData? Data { get; set; }
+
+  /// <summary>Error payload when the webhook event represents a failure state.</summary>
+  public ParagonWebhookError? Error { get; set; }
+}
+
+/// <summary>User metadata included in a Paragon webhook.</summary>
+public class ParagonWebhookUser
+{
+  /// <summary>Paragon user identifier for the connected user.</summary>
+  public string Id { get; set; } = string.Empty;
+}
+
+/// <summary>Event data section of a Paragon webhook payload.</summary>
+public class ParagonWebhookData
+{
+  /// <summary>Logical model type for the emitted record event.</summary>
+  public string Model { get; set; } = string.Empty;
+
+  /// <summary>Record identifier relevant to create/update/delete record events.</summary>
+  public string? RecordId { get; set; }
+
+  /// <summary>Timestamp indicating when the sync data was last synchronized.</summary>
+  public string? SyncedAt { get; set; }
+
+  /// <summary>Number of records referenced by the event when available.</summary>
+  public int? NumRecords { get; set; }
+}
+
+/// <summary>Error details included with failed sync webhook events.</summary>
+public class ParagonWebhookError
+{
+  /// <summary>Provider-specific error code.</summary>
+  public string? Code { get; set; }
+
+  /// <summary>Human-readable error description.</summary>
+  public string? Message { get; set; }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Domain/DTOs/StorageItemResponse.cs

@@ -1,3 +1,5 @@
+using ParagonPlayground.Domain.Entities;
+
 namespace ParagonPlayground.Domain.DTOs;
 
 /// <summary>File or folder returned by the storage API.</summary>
@@ -24,6 +26,12 @@ public class StorageItemResponse
   /// <summary>Direct SharePoint web URL (null for folders).</summary>
   public string? SharePointWebUrl { get; set; }
 
+  /// <summary>Indicates if the storage item is associated with a managed sync.</summary>
+  public bool IsManagedSync { get; set; }
+
+  /// <summary>Indicates if the storage item can be edited by our application.</summary>
+  public bool IsReadOnly { get; set; }
+
   /// <summary>User who created this item.</summary>
   public string CreatedByUserId { get; set; } = string.Empty;
 
@@ -32,4 +40,27 @@ public class StorageItemResponse
 
   /// <summary>Timestamp when the item was created.</summary>
   public DateTime CreatedAt { get; set; }
+
+  /// <summary>Creates a response DTO from a storage item entity.</summary>
+  public static StorageItemResponse From(StorageItem item, string createdByDisplayName)
+  {
+    ArgumentNullException.ThrowIfNull(item);
+    ArgumentNullException.ThrowIfNull(createdByDisplayName);
+
+    return new StorageItemResponse
+    {
+      Id = item.Id,
+      Name = item.Name,
+      IsFolder = item.IsFolder,
+      ParentId = item.ParentId,
+      ContentType = item.ContentType,
+      FileSize = item.FileSize,
+      SharePointWebUrl = item.SharePointWebUrl,
+      IsManagedSync = item.IsManagedSync,
+      IsReadOnly = item.IsReadOnly,
+      CreatedByUserId = item.CreatedByUserId,
+      CreatedByDisplayName = createdByDisplayName,
+      CreatedAt = item.CreatedAt,
+    };
+  }
 }

src/ParagonPlayground/backend/src/ParagonPlayground.Domain/DTOs/SyncedRecordsResponse.cs

@@ -0,0 +1,84 @@
+using System.Collections.ObjectModel;
+using System.Text.Json.Serialization;
+
+namespace ParagonPlayground.Domain.DTOs;
+
+/// <summary>Response payload returned by the Paragon Sync API GET /api/syncs/{syncId}/records endpoint.</summary>
+public class SyncedRecordsResponse
+{
+  /// <summary>Synced records returned for the requested page.</summary>
+  [JsonPropertyName("data")]
+  public Collection<SyncedRecordItem> Data { get; init; } = [];
+
+  /// <summary>Paging metadata used to continue retrieving additional records.</summary>
+  [JsonPropertyName("paging")]
+  public SyncedRecordsPaging Paging { get; set; } = new();
+}
+
+
+/// <summary>Pagination metadata returned with synced record batches.</summary>
+public class SyncedRecordsPaging
+{
+  /// <summary>Total number of records known to the sync.</summary>
+  [JsonPropertyName("totalRecords")]
+  public int TotalRecords { get; set; }
+
+  /// <summary>Total number of active (non-deleted) records in the sync.</summary>
+  [JsonPropertyName("totalActiveRecords")]
+  public int TotalActiveRecords { get; set; }
+
+  /// <summary>Count of records still remaining after the current page.</summary>
+  [JsonPropertyName("remainingRecords")]
+  public int RemainingRecords { get; set; }
+
+  /// <summary>Cursor to request the next page of records.</summary>
+  [JsonPropertyName("cursor")]
+  public string? Cursor { get; set; }
+
+  /// <summary>Unix timestamp of the latest record observed in this page.</summary>
+  [JsonPropertyName("lastSeen")]
+  public long LastSeen { get; set; }
+}
+
+
+/// <summary>Represents a single synced file or record item returned by Paragon Managed Sync.</summary>
+public class SyncedRecordItem
+{
+  /// <summary>Paragon-generated sync record identifier.</summary>
+  [JsonPropertyName("id")]
+  public string Id { get; set; } = string.Empty;
+
+  /// <summary>Provider-native record identifier (for example, SharePoint drive item ID).</summary>
+  [JsonPropertyName("externalId")]
+  public string ExternalId { get; set; } = string.Empty;
+
+  /// <summary>Display name for the synced file or folder.</summary>
+  [JsonPropertyName("name")]
+  public string Name { get; set; } = "Untitled Item";
+
+  /// <summary>MIME type of the synced file; empty for folders.</summary>
+  [JsonPropertyName("mimeType")]
+  public string MimeType { get; set; } = "application/octet-stream";
+
+  /// <summary>File size in bytes.</summary>
+  [JsonPropertyName("size")]
+  public long Size { get; set; }
+
+  /// <summary>Provider URL for viewing the record in the source system.</summary>
+  [JsonPropertyName("url")]
+  public string Url { get; set; } = string.Empty;
+
+  /// <summary>External identifier of the record's parent folder.</summary>
+  [JsonPropertyName("parentFolderId")]
+  public string ParentFolderId { get; set; } = string.Empty;
+
+  /// <summary>Integration-specific metadata attached to the synced record.</summary>
+  [JsonPropertyName("customFields")]
+  public Dictionary<string, object>? CustomFields { get; init; }
+
+  /// <summary>Determines whether the synced item represents a folder.</summary>
+  public bool IsFolder()
+  {
+    return string.IsNullOrEmpty(MimeType);
+  }
+}

src/ParagonPlayground/backend/src/ParagonPlayground.Domain/Entities/StorageItem.cs

@@ -24,6 +24,7 @@ public class StorageItem
   /// <summary>File size in bytes (0 for folders).</summary>
   public long FileSize { get; set; }
 
+
   /// <summary>SharePoint site ID where the file was uploaded (null for folders).</summary>
   public string? SharePointSiteId { get; set; }
 
@@ -33,6 +34,23 @@ public class StorageItem
   /// <summary>SharePoint web URL for direct access (null for folders).</summary>
   public string? SharePointWebUrl { get; set; }
 
+
+  /// <summary>Indicates whether the storage item is associated with a managed sync</summary>
+  public bool IsManagedSync { get; set; }
+
+  /// <summary>Identifies the managed sync this storage item is attached to.</summary>
+  public string ManagedSyncId { get; set; } = string.Empty;
+
+  /// <summary>Paragon Sync record ID (sync-generated UUID) for items ingested from managed sync.</summary>
+  public string ParagonRecordId { get; set; } = string.Empty;
+
+  /// <summary>Identifies the sharepoint folder id that the managed sync is attached to.</summary>
+  public string SharePointFolderId { get; set; } = string.Empty;
+
+  /// <summary>Indicates whether the storage item can be edited or modified by our application.</summary>
+  public bool IsReadOnly { get; set; }
+
+
   /// <summary>User who created this item.</summary>
   public string CreatedByUserId { get; set; } = string.Empty;
 

src/ParagonPlayground/backend/src/ParagonPlayground.Infrastructure/Data/StorageItemRepository.cs

@@ -11,7 +11,10 @@ public class StorageItemRepository(MongoDbContext context)
 
   /// <summary>Lists items in a folder (or root items when parentId is null).</summary>
   public async Task<List<StorageItem>> GetByParentIdAsync(
-    string organizationId, string? parentId, CancellationToken ct)
+    string organizationId,
+    string? parentId,
+    CancellationToken ct
+  )
   {
     var filter = Builders<StorageItem>.Filter.Eq(i => i.OrganizationId, organizationId)
       & Builders<StorageItem>.Filter.Eq(i => i.ParentId, parentId);
@@ -23,6 +26,14 @@ public class StorageItemRepository(MongoDbContext context)
       .ConfigureAwait(false);
   }
 
+  /// <summary>Lists all direct child items of a given parent folder.</summary>
+  public async Task<List<StorageItem>> GetChildrenAsync(string parentId, CancellationToken ct)
+  {
+    return await _context.StorageItems.Find(i => i.ParentId == parentId)
+      .ToListAsync(ct)
+      .ConfigureAwait(false);
+  }
+
   /// <summary>Finds a storage item by ID.</summary>
   public async Task<StorageItem?> GetByIdAsync(string id, CancellationToken ct)
   {
@@ -31,6 +42,68 @@ public class StorageItemRepository(MongoDbContext context)
       .ConfigureAwait(false);
   }
 
+  /// <summary>Finds a root storage item by Paragon Managed Sync ID.</summary>
+  public async Task<StorageItem?> GetByManagedSyncIdAsync(string managedSyncId, CancellationToken ct)
+  {
+    return await _context.StorageItems.Find(i => i.ManagedSyncId == managedSyncId)
+      .FirstOrDefaultAsync(ct)
+      .ConfigureAwait(false);
+  }
+
+  /// <summary>Finds a storage item by organization ID and SharePoint Drive Item ID.</summary>
+  public async Task<StorageItem?> GetBySharePointDriveItemIdAsync(
+    string organizationId,
+    string sharePointDriveItemId,
+    CancellationToken ct
+  )
+  {
+    var filter = Builders<StorageItem>.Filter.Eq(i => i.OrganizationId, organizationId)
+      & Builders<StorageItem>.Filter.Eq(i => i.SharePointDriveItemId, sharePointDriveItemId);
+
+    return await _context.StorageItems.Find(filter)
+      .FirstOrDefaultAsync(ct)
+      .ConfigureAwait(false);
+  }
+
+  /// <summary>Finds a synced storage item by organization, sync ID, and Paragon record ID.</summary>
+  public async Task<StorageItem?> GetByParagonRecordIdAsync(
+    string organizationId,
+    string managedSyncId,
+    string paragonRecordId,
+    CancellationToken ct
+  )
+  {
+    var filter = Builders<StorageItem>.Filter.Eq(i => i.OrganizationId, organizationId)
+      & Builders<StorageItem>.Filter.Eq(i => i.ManagedSyncId, managedSyncId)
+      & Builders<StorageItem>.Filter.Eq(i => i.ParagonRecordId, paragonRecordId);
+
+    return await _context.StorageItems.Find(filter)
+      .FirstOrDefaultAsync(ct)
+      .ConfigureAwait(false);
+  }
+
+  /// <summary>Finds storage items by organization ID and SharePoint Drive Item IDs.</summary>
+  public async Task<List<StorageItem>> GetBySharePointDriveItemIdsAsync(
+    string organizationId,
+    IReadOnlyCollection<string> sharePointDriveItemIds,
+    CancellationToken ct
+  )
+  {
+    ArgumentNullException.ThrowIfNull(sharePointDriveItemIds);
+
+    if (sharePointDriveItemIds.Count == 0)
+    {
+      return [];
+    }
+
+    var filter = Builders<StorageItem>.Filter.Eq(i => i.OrganizationId, organizationId)
+      & Builders<StorageItem>.Filter.In(i => i.SharePointDriveItemId, sharePointDriveItemIds);
+
+    return await _context.StorageItems.Find(filter)
+      .ToListAsync(ct)
+      .ConfigureAwait(false);
+  }
+
   /// <summary>Creates a new storage item.</summary>
   public async Task CreateAsync(StorageItem item, CancellationToken ct)
   {
@@ -41,6 +114,16 @@ public class StorageItemRepository(MongoDbContext context)
       .ConfigureAwait(false);
   }
 
+  /// <summary>Updates an existing storage item.</summary>
+  public async Task UpdateAsync(StorageItem item, CancellationToken ct)
+  {
+    ArgumentNullException.ThrowIfNull(item);
+
+    _ = await _context.StorageItems
+      .ReplaceOneAsync(i => i.Id == item.Id, item, cancellationToken: ct)
+      .ConfigureAwait(false);
+  }
+
   /// <summary>Deletes a storage item by ID.</summary>
   public async Task DeleteAsync(string id, CancellationToken ct)
   {

src/ParagonPlayground/frontend/src/components/AppIcon.vue

@@ -1,5 +1,6 @@
 <script setup lang="ts">
-  type IconName = 'folder' | 'file' | 'upload' | 'download' | 'external' | 'trash' | 'x' | 'plus';
+  type IconName =
+    'folder' | 'file' | 'upload' | 'download' | 'external' | 'trash' | 'x' | 'plus' | 'sharepoint';
 
   const props = withDefaults(defineProps<{ name: IconName; size?: number }>(), {
     size: 16,
@@ -24,6 +25,11 @@
     ],
     x: ['M18 6 6 18', 'm6 6 12 12'],
     plus: ['M5 12h14', 'M12 5v14'],
+    sharepoint: [
+      'M4 14.899A7 7 0 1 1 15.71 8h1.79a4.5 4.5 0 0 1 2.5 8.242',
+      'M12 12v6',
+      'm-2.5-2.5 2.5 2.5 2.5-2.5',
+    ],
   };
 </script>
 

src/ParagonPlayground/frontend/src/services/auth.ts

@@ -1,6 +1,6 @@
 import { api } from './api';
 
-export interface UserResponse {
+export type UserResponse = {
   id: string;
   email: string;
   displayName: string;

src/ParagonPlayground/frontend/src/services/integration.ts

@@ -1,11 +1,11 @@
 import { api } from './api';
 
-export interface ParagonTokenResponse {
+export type ParagonTokenResponse = {
   paragonJwt: string;
   projectId: string;
 }
 
-export interface IntegrationConfig {
+export type IntegrationConfig = {
   id: string;
   organizationId: string;
   connectionMode: string;
@@ -15,20 +15,20 @@ export interface IntegrationConfig {
   updatedAt: string;
 }
 
-export interface IntegrationConfigRequest {
+export type IntegrationConfigRequest = {
   connectionMode: string;
   sharePointSiteUrl: string | null;
   sharePointFolderPath: string | null;
 }
 
-export interface CredentialResponse {
+export type CredentialResponse = {
   id: string;
   credentialId: string;
   integrationType: string;
   connectedAt: string;
 }
 
-export interface CredentialRequest {
+export type CredentialRequest = {
   credentialId: string;
   integrationType: string;
 }

src/ParagonPlayground/frontend/src/services/storage.ts

@@ -1,6 +1,6 @@
 import { api } from './api';
 
-export interface StorageItem {
+export type StorageItem = {
   id: string;
   name: string;
   isFolder: boolean;
@@ -11,18 +11,35 @@ export interface StorageItem {
   createdByUserId: string;
   createdByDisplayName: string;
   createdAt: string;
+  isReadOnly: boolean;
+  isManagedSync: boolean;
 }
 
-export interface CreateFolderRequest {
+export type CreateFolderRequest = {
   name: string;
   parentId: string | null;
 }
 
-export interface DownloadResponse {
+export type DownloadResponse = {
   sharePointUrl: string | null;
   proxyUrl: string | null;
 }
 
+export type CreateSyncedFolderRequest = {
+  sharePointFolderId: string;
+  sharePointSiteId: string;
+  parentId?: string | null;
+  credentialId?: string;
+}
+
+export async function createSyncedFolder(req: CreateSyncedFolderRequest): Promise<StorageItem> {
+  return api<StorageItem>('/storage/synced-folders', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(req),
+  });
+}
+
 export async function getItems(parentId?: string | null): Promise<StorageItem[]> {
   const params = parentId ? `?parentId=${encodeURIComponent(parentId)}` : '';
   return api<StorageItem[]>(`/storage${params}`);

src/ParagonPlayground/frontend/src/styles/main.css

@@ -129,7 +129,8 @@ select:focus {
   transform: translateY(1px);
 }
 
-.btn:disabled {
+.btn:disabled,
+.btn.disabled {
   opacity: 0.55;
   cursor: not-allowed;
 }

src/ParagonPlayground/frontend/src/views/FileExplorerPage.vue

@@ -9,8 +9,44 @@
     deleteItem,
     getDownloadUrls,
     type StorageItem,
+    createSyncedFolder,
   } from '../services/storage';
   import { formatLocaleDate } from '../utils/utils';
+  import { getParagonToken } from '../services/integration';
+
+  type SharePointIds = {
+    listId: string;
+    webId: string;
+    siteId: string;
+    listItemId: string;
+    listItemUniqueId: string;
+  };
+
+  type ParentReference = {
+    driveId: string;
+    sharepointIds: SharePointIds;
+  };
+
+  type SelectedFilePickerItem = {
+    id: string;
+    parentReference: ParentReference;
+    sharepointIds: SharePointIds;
+  };
+
+  type ParagonPickerInstance = {
+    init: () => Promise<void>;
+    open: () => void;
+  };
+
+  type ParagonSDKWithPicker = {
+    authenticate: (projectId: string, jwt: string) => Promise<void>;
+    ExternalFilePicker: new (
+      integration: string,
+      options: {
+        onFileSelect: (items: SelectedFilePickerItem[]) => Promise<void> | void;
+      },
+    ) => ParagonPickerInstance;
+  };
 
   const route = useRoute();
   const router = useRouter();
@@ -18,13 +54,14 @@
   const items = ref<StorageItem[]>([]);
   const loading = ref(true);
   const error = ref('');
-  const currentFolderId = ref<string | null>(null);
   const breadcrumbs = ref<{ id: string | null; name: string }[]>([]);
   const showNewFolder = ref(false);
   const newFolderName = ref('');
+  const currentFolder = ref<StorageItem | null>(null);
 
   const folders = computed(() => items.value.filter((i) => i.isFolder));
   const files = computed(() => items.value.filter((i) => !i.isFolder));
+  const isCurrentFolderReadOnly = computed(() => currentFolder.value?.isReadOnly ?? false);
 
   const pathSegments = computed(() => {
     const raw = route.params.pathMatch;
@@ -51,6 +88,7 @@
     try {
       let parentId: string | null = null;
       const crumbs: { id: string | null; name: string }[] = [];
+      let resolvedFolder: StorageItem | null = null;
 
       for (const name of segments) {
         const children = await getItems(parentId);
@@ -64,15 +102,17 @@
 
         crumbs.push({ id: folder.id, name: folder.name });
         parentId = folder.id;
+        resolvedFolder = folder;
       }
 
-      currentFolderId.value = parentId;
+      currentFolder.value = resolvedFolder;
       breadcrumbs.value = crumbs;
 
-      items.value = await getItems(currentFolderId.value);
+      items.value = await getItems(currentFolder.value?.id ?? null);
     } catch (e: unknown) {
       error.value = e instanceof Error ? e.message : 'Failed to navigate';
       items.value = [];
+      currentFolder.value = null;
     } finally {
       loading.value = false;
     }
@@ -94,7 +134,7 @@
     try {
       await createFolder({
         name: newFolderName.value.trim(),
-        parentId: currentFolderId.value,
+        parentId: currentFolder.value?.id ?? null,
       });
 
       newFolderName.value = '';
@@ -115,7 +155,7 @@
     }
 
     try {
-      await uploadFile(file, currentFolderId.value);
+      await uploadFile(file, currentFolder.value?.id ?? null);
 
       input.value = '';
 
@@ -167,6 +207,39 @@
     if (bytes < 1048576) return `${(bytes / 1024).toFixed(1)} KB`;
     return `${(bytes / 1048576).toFixed(1)} MB`;
   }
+
+  async function openSharePointFolderPicker() {
+    try {
+      const tokenResponse = await getParagonToken();
+      const { paragon } = await import('@useparagon/connect');
+      const sdk = paragon as unknown as ParagonSDKWithPicker;
+
+      await sdk.authenticate(tokenResponse.projectId, tokenResponse.paragonJwt);
+
+      const picker = new sdk.ExternalFilePicker('sharepoint', {
+        onFileSelect: async (selectedItems: SelectedFilePickerItem[]) => {
+          if (!selectedItems || selectedItems.length === 0) return;
+
+          const selectedItem = selectedItems[0];
+          const folderId = selectedItem.id;
+          const siteId = selectedItem.sharepointIds.siteId;
+
+          await createSyncedFolder({
+            sharePointFolderId: folderId,
+            sharePointSiteId: siteId,
+            parentId: currentFolder.value?.id ?? null,
+          });
+
+          await navigateToPath(pathSegments.value);
+        },
+      });
+
+      await picker.init();
+      picker.open();
+    } catch (e: unknown) {
+      error.value = e instanceof Error ? e.message : 'Failed to open SharePoint picker';
+    }
+  }
 </script>
 
 <template>
@@ -185,7 +258,7 @@
     <nav class="breadcrumbs">
       <button
         class="crumb"
-        :class="{ active: currentFolderId === null }"
+        :class="{ active: currentFolder === null }"
         @click="navigateToBreadcrumb(0)"
       >
         Root
@@ -208,6 +281,7 @@
     <div class="toolbar">
       <button
         class="btn"
+        :disabled="isCurrentFolderReadOnly"
         @click="showNewFolder = !showNewFolder"
       >
         <AppIcon
@@ -218,7 +292,10 @@
         {{ showNewFolder ? 'Cancel' : 'New Folder' }}
       </button>
 
-      <label class="btn btn-primary upload-label">
+      <label
+        class="btn btn-primary upload-label"
+        :class="{ disabled: isCurrentFolderReadOnly }"
+      >
         <AppIcon
           name="upload"
           :size="14"
@@ -227,9 +304,21 @@
         <input
           type="file"
           hidden
+          :disabled="isCurrentFolderReadOnly"
           @change="handleUpload"
         />
       </label>
+
+      <button
+        class="btn btn-secondary"
+        @click="openSharePointFolderPicker"
+      >
+        <AppIcon
+          name="sharepoint"
+          :size="14"
+        />
+        Sync Folder from SharePoint
+      </button>
     </div>
 
     <div
@@ -289,6 +378,7 @@
         <span class="item-date">{{ formatLocaleDate(folder.createdAt) }}</span>
         <span class="item-actions">
           <button
+            v-if="!folder.isReadOnly || folder.isManagedSync"
             class="btn-small btn-small-danger"
             title="Delete"
             @click="handleDelete(folder.id)"
@@ -337,6 +427,7 @@
             />
           </button>
           <button
+            v-if="!file.isReadOnly"
             class="btn-small btn-small-danger"
             title="Delete"
             @click="handleDelete(file.id)"