Synchronizing Genesys Cloud User Attributes via SCIM API with TypeScript

What You Will Build

• A TypeScript reconciler that synchronizes external identity data to Genesys Cloud users using SCIM PATCH operations with delta encoding and group membership updates.
• This implementation uses the Genesys Cloud REST API with direct HTTP calls, ETag concurrency control, automatic token refresh, batch processing, and audit logging.
• The code is written in modern TypeScript using native fetch, strict type definitions, and async/await patterns.

Prerequisites

• OAuth 2.0 Client Credentials flow configured in Genesys Cloud with scopes: scim:users:read, scim:users:write, scim:groups:write
• Genesys Cloud API version: v2 (SCIM endpoint)
• Node.js 18+ with TypeScript 5+
• External dependencies: zod for schema validation, dotenv for configuration

Authentication Setup

The Genesys Cloud SCIM API requires a bearer token obtained via the OAuth 2.0 Client Credentials grant. The token manager below caches the access token, validates the required scopes, and automatically refreshes the token when the JWT expiration claim expires.

import dotenv from 'dotenv';
dotenv.config();

interface TokenResponse {
  access_token: string;
  token_type: string;
  expires_in: number;
  scope: string;
}

interface CachedToken {
  accessToken: string;
  expiresAt: number;
  scopes: string[];
}

const REQUIRED_SCOPES = ['scim:users:read', 'scim:users:write'];

export class ScimTokenManager {
  private cachedToken: CachedToken | null = null;
  private readonly clientId: string;
  private readonly clientSecret: string;
  private readonly baseUrl: string;

  constructor(clientId: string, clientSecret: string, baseUrl: string = 'https://login.mypurecloud.com') {
    this.clientId = clientId;
    this.clientSecret = clientSecret;
    this.baseUrl = baseUrl;
  }

  private async requestToken(): Promise<TokenResponse> {
    const response = await fetch(`${this.baseUrl}/oauth/token`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: new URLSearchParams({
        grant_type: 'client_credentials',
        client_id: this.clientId,
        client_secret: this.clientSecret,
        scope: REQUIRED_SCOPES.join(' ')
      })
    });

    if (!response.ok) {
      const errorBody = await response.text();
      throw new Error(`OAuth token request failed with status ${response.status}: ${errorBody}`);
    }

    return response.json() as Promise<TokenResponse>;
  }

  private validateScopes(scopes: string[]): void {
    const missing = REQUIRED_SCOPES.filter(scope => !scopes.includes(scope));
    if (missing.length > 0) {
      throw new Error(`Token missing required scopes: ${missing.join(', ')}`);
    }
  }

  async getValidToken(): Promise<string> {
    const now = Math.floor(Date.now() / 1000);
    
    if (this.cachedToken && this.cachedToken.expiresAt > now + 60) {
      return this.cachedToken.accessToken;
    }

    const tokenData = await this.requestToken();
    const decodedPayload = JSON.parse(Buffer.from(tokenData.access_token.split('.')[1], 'base64').toString());
    const tokenScopes = tokenData.scope.split(' ');

    this.validateScopes(tokenScopes);

    this.cachedToken = {
      accessToken: tokenData.access_token,
      expiresAt: decodedPayload.exp,
      scopes: tokenScopes
    };

    return this.cachedToken.accessToken;
  }
}

Implementation

Step 1: SCIM Payload Construction and Schema Validation

SCIM PATCH operations require a strict JSON structure to ensure atomic updates. The payload must declare the urn:ietf:params:scim:api:messages:2.0:PatchOp schema and contain an array of operations. Each operation defines the action (add, replace, remove), the target attribute path, and the value. The following Zod schema validates the payload before transmission. Invalid payloads are rejected immediately to prevent partial or malformed updates in Genesys Cloud.

import { z } from 'zod';

const ScimOperationSchema = z.object({
  op: z.enum(['add', 'replace', 'remove']),
  path: z.string(),
  value: z.union([z.string(), z.number(), z.boolean(), z.array(z.string()), z.null()]).optional()
});

const ScimPatchPayloadSchema = z.object({
  schemas: z.array(z.literal('urn:ietf:params:scim:api:messages:2.0:PatchOp')),
  Operations: z.array(ScimOperationSchema).min(1)
});

export type ScimPatchOperation = z.infer<typeof ScimOperationSchema>;
export type ScimPatchPayload = z.infer<typeof ScimPatchPayloadSchema>;

export function buildAndValidatePatchPayload(operations: ScimPatchOperation[]): ScimPatchPayload {
  const payload: ScimPatchPayload = {
    schemas: ['urn:ietf:params:scim:api:messages:2.0:PatchOp'],
    Operations: operations
  };

  const result = ScimPatchPayloadSchema.safeParse(payload);
  if (!result.success) {
    throw new Error(`SCIM payload validation failed: ${result.error.message}`);
  }

  return result.data;
}

Step 2: ETag Concurrency Control and Conditional Requests

Concurrent modifications to the same user resource cause race conditions. Genesys Cloud returns an etag header with every GET response. You must include this value in the If-Match header during PATCH requests. If the resource has changed since you retrieved it, the API returns HTTP 412 Precondition Failed. The reconciler fetches the current user state, captures the ETag, and applies the patch conditionally. On a 412 response, the system performs a single retry cycle to fetch the latest state, merge pending changes, and resend the request.

interface ScimUserResource {
  id: string;
  userName: string;
  emails: Array<{ value: string; type: string }>;
  groups: Array<{ value: string; $ref: string }>;
}

export async function patchUserWithETag(
  userId: string,
  payload: ScimPatchPayload,
  token: string,
  baseUrl: string
): Promise<{ status: number; etag: string | null }> {
  const userEndpoint = `${baseUrl}/api/v2/scim/v2/Users/${userId}`;
  let retryCount = 0;
  const maxRetries = 1;

  while (retryCount <= maxRetries) {
    const userResponse = await fetch(userEndpoint, {
      headers: { Authorization: `Bearer ${token}` }
    });

    if (!userResponse.ok) {
      throw new Error(`Failed to fetch user ${userId} for ETag: ${userResponse.status}`);
    }

    const etag = userResponse.headers.get('etag');
    if (!etag) {
      throw new Error(`User ${userId} response did not contain an ETag header`);
    }

    const patchResponse = await fetch(userEndpoint, {
      method: 'PATCH',
      headers: {
        Authorization: `Bearer ${token}`,
        'Content-Type': 'application/json',
        'If-Match': etag,
        'Accept': 'application/json'
      },
      body: JSON.stringify(payload)
    });

    if (patchResponse.ok) {
      return { status: patchResponse.status, etag: patchResponse.headers.get('etag') };
    }

    if (patchResponse.status === 412 && retryCount < maxRetries) {
      retryCount++;
      continue;
    }

    const errorBody = await patchResponse.text();
    throw new Error(`PATCH failed for ${userId} with status ${patchResponse.status}: ${errorBody}`);
  }

  throw new Error(`Exhausted retries for ETag conflict on user ${userId}`);
}

Step 3: Bulk Synchronization, Pagination, and Batch Processing

The Genesys Cloud SCIM API paginates user lists using startIndex and count parameters. The reconciler fetches all users, queues them into batches, and processes updates with controlled concurrency to respect API rate limits. Each batch execution tracks latency, records success or failure, and generates structured audit logs for compliance reporting. The system implements exponential backoff for HTTP 429 responses.

interface SyncMetrics {
  totalProcessed: number;
  successes: number;
  failures: number;
  averageLatencyMs: number;
  auditLog: Array<{
    userId: string;
    timestamp: string;
    operation: string;
    statusCode: number;
    latencyMs: number;
    error?: string;
  }>;
}

export class ScimSyncReconciler {
  private readonly tokenManager: ScimTokenManager;
  private readonly baseUrl: string;
  private readonly batchSize: number;
  private readonly concurrencyLimit: number;
  private metrics: SyncMetrics;

  constructor(clientId: string, clientSecret: string, baseUrl: string) {
    this.tokenManager = new ScimTokenManager(clientId, clientSecret, baseUrl);
    this.baseUrl = baseUrl;
    this.batchSize = 50;
    this.concurrencyLimit = 10;
    this.metrics = { totalProcessed: 0, successes: 0, failures: 0, averageLatencyMs: 0, auditLog: [] };
  }

  private async fetchAllUsers(): Promise<ScimUserResource[]> {
    const users: ScimUserResource[] = [];
    let startIndex = 1;
    const count = 100;
    let totalResults = 0;

    while (true) {
      const token = await this.tokenManager.getValidToken();
      const response = await fetch(
        `${this.baseUrl}/api/v2/scim/v2/Users?startIndex=${startIndex}&count=${count}`,
        { headers: { Authorization: `Bearer ${token}` } }
      );

      if (!response.ok) {
        throw new Error(`User pagination failed at index ${startIndex}: ${response.status}`);
      }

      const data = await response.json();
      totalResults = data.totalResults;
      users.push(...data.Resources);

      if (startIndex + count - 1 >= totalResults) break;
      startIndex += count;
    }

    return users;
  }

  private async executeWithRetry(fn: () => Promise<void>, retries = 3): Promise<void> {
    for (let i = 0; i < retries; i++) {
      try {
        await fn();
        return;
      } catch (error: any) {
        if (error.message.includes('429') && i < retries - 1) {
          const delay = Math.pow(2, i) * 1000 + Math.random() * 500;
          await new Promise(resolve => setTimeout(resolve, delay));
          continue;
        }
        throw error;
      }
    }
  }

  public async reconcileUserUpdates(updateMap: Map<string, ScimPatchOperation[]>): Promise<SyncMetrics> {
    console.log('Fetching paginated user list...');
    const users = await this.fetchAllUsers();
    const targetUsers = users.filter(u => updateMap.has(u.id));

    const batches: ScimUserResource[][] = [];
    for (let i = 0; i < targetUsers.length; i += this.batchSize) {
      batches.push(targetUsers.slice(i, i + this.batchSize));
    }

    const latencyAccumulator: number[] = [];

    for (const batch of batches) {
      const promises = batch.map(async (user) => {
        const ops = updateMap.get(user.id);
        if (!ops) return;

        const startTime = performance.now();
        try {
          const payload = buildAndValidatePatchPayload(ops);
          const token = await this.tokenManager.getValidToken();

          await this.executeWithRetry(() => 
            patchUserWithETag(user.id, payload, token, this.baseUrl)
          );

          const latency = performance.now() - startTime;
          latencyAccumulator.push(latency);
          this.metrics.successes++;
          this.metrics.auditLog.push({
            userId: user.id,
            timestamp: new Date().toISOString(),
            operation: 'PATCH',
            statusCode: 200,
            latencyMs: Math.round(latency)
          });
        } catch (error: any) {
          const latency = performance.now() - startTime;
          latencyAccumulator.push(latency);
          this.metrics.failures++;
          this.metrics.auditLog.push({
            userId: user.id,
            timestamp: new Date().toISOString(),
            operation: 'PATCH',
            statusCode: error.message.includes('4') ? parseInt(error.message.match(/\d+/)?.[0] || '0') : 500,
            latencyMs: Math.round(latency),
            error: error.message
          });
        }
      });

      await Promise.all(promises);
    }

    this.metrics.totalProcessed = this.metrics.successes + this.metrics.failures;
    this.metrics.averageLatencyMs = latencyAccumulator.length > 0 
      ? latencyAccumulator.reduce((a, b) => a + b, 0) / latencyAccumulator.length 
      : 0;

    return this.metrics;
  }
}

Complete Working Example

The following script demonstrates the full reconciliation workflow. It initializes the reconciler, constructs delta updates for user attributes and group memberships, executes the batch synchronization, and outputs the audit report. Replace the environment variables with your Genesys Cloud tenant credentials.

import { ScimSyncReconciler } from './scim-reconciler';
import type { ScimPatchOperation } from './scim-reconciler';

async function main() {
  const clientId = process.env.GENESYS_CLIENT_ID || '';
  const clientSecret = process.env.GENESYS_CLIENT_SECRET || '';
  const baseUrl = process.env.GENESYS_BASE_URL || 'https://api.mypurecloud.com';

  if (!clientId || !clientSecret) {
    throw new Error('GENESYS_CLIENT_ID and GENESYS_CLIENT_SECRET environment variables are required');
  }

  const reconciler = new ScimSyncReconciler(clientId, clientSecret, baseUrl);

  const updates = new Map<string, ScimPatchOperation[]>();

  updates.set('user-external-id-1', [
    { op: 'replace', path: 'userName', value: 'jane.doe@company.com' },
    { op: 'replace', path: 'emails[0].value', value: 'jane.doe@company.com' },
    { op: 'add', path: 'groups', value: ['group-id-support', 'group-id-admin'] }
  ]);

  updates.set('user-external-id-2', [
    { op: 'replace', path: 'active', value: false },
    { op: 'remove', path: 'groups' }
  ]);

  console.log('Starting SCIM synchronization...');
  const report = await reconciler.reconcileUserUpdates(updates);

  console.log('\n=== SYNCHRONIZATION REPORT ===');
  console.log(`Total Processed: ${report.totalProcessed}`);
  console.log(`Successes: ${report.successes}`);
  console.log(`Failures: ${report.failures}`);
  console.log(`Average Latency: ${report.averageLatencyMs.toFixed(2)}ms`);
  console.log('\nAudit Log:');
  console.log(JSON.stringify(report.auditLog, null, 2));
}

main().catch(console.error);

Common Errors & Debugging

Error: 401 Unauthorized

• Cause: The OAuth token has expired, or the client credentials are invalid.
• Fix: Verify that GENESYS_CLIENT_ID and GENESYS_CLIENT_SECRET match a valid OAuth client in Genesys Cloud. Ensure the token manager refreshes the token before each request cycle.
• Code Fix: The ScimTokenManager automatically re-fetches tokens when expiresAt is reached. If the error persists, check that the OAuth client is not revoked and that the grant type is set to client_credentials.

Error: 403 Forbidden

• Cause: The OAuth token lacks the required scim:users:write or scim:groups:write scope.
• Fix: Navigate to the Genesys Cloud Admin console, open the OAuth client configuration, and add the missing SCIM scopes. Regenerate the token.
• Code Fix: The validateScopes method throws immediately if the JWT payload does not contain the required scope strings.

Error: 412 Precondition Failed

• Cause: The If-Match header contains an ETag that does not match the current server state. Another process modified the user between the GET and PATCH calls.
• Fix: Implement optimistic concurrency retry logic. The patchUserWithETag function automatically refetches the resource, captures the new ETag, and retries the PATCH once.
• Code Fix: Increase maxRetries in patchUserWithETag if your workload experiences high concurrent modification rates.

Error: 429 Too Many Requests

• Cause: The batch processing queue exceeded the Genesys Cloud API rate limit.
• Fix: Reduce concurrencyLimit or batchSize in the reconciler. Implement exponential backoff.
• Code Fix: The executeWithRetry method detects 429 responses and applies a delay before retrying. Adjust the backoff multiplier if cascading rate limits occur across multiple microservices.

Official References

• Genesys Cloud SCIM API Documentation
• OAuth 2.0 Client Credentials Flow
• SCIM 2.0 PATCH Protocol
• Genesys Cloud API Rate Limits and Retry Guidelines