Attaching Genesys Cloud Audio Transcripts to Recordings via Media API with TypeScript

What You Will Build

A TypeScript service that validates, attaches, and tracks transcript payloads to Genesys Cloud recordings using the Media API. The code constructs attach payloads with recording ID references, validates chunk matrices and alignment offsets, enforces size and MIME constraints, executes atomic POST operations, tracks latency and success rates, generates audit logs, and synchronizes attachment events with external archival systems via webhook callbacks.

Prerequisites

• OAuth client credentials flow with media:transcript:write, media:recording:read, and oauth:client:credentials scopes
• Genesys Cloud PureCloud Platform Client SDK v2 (@genesyscloud/purecloud-platform-client-v2)
• Node.js 18 or later with TypeScript 5+
• External dependencies: axios, uuid, dotenv
• Access to a Genesys Cloud organization with recording and transcript permissions

Authentication Setup

The Genesys Cloud SDK handles token acquisition and refresh automatically when configured with client credentials. You must provide the environment URL, client ID, and client secret. The SDK caches the access token and refreshes it before expiration.

import { PlatformClient } from '@genesyscloud/purecloud-platform-client-v2';
import * as dotenv from 'dotenv';

dotenv.config();

const region = process.env.GENESYS_REGION || 'mypurecloud.ie';
const clientId = process.env.GENESYS_CLIENT_ID!;
const clientSecret = process.env.GENESYS_CLIENT_SECRET!;

const platformClient = PlatformClient.create({
  host: `https://${region}.mypurecloud.com`,
  clientId,
  clientSecret,
});

// Initialize OAuth2 client credentials flow
const oauthClient = platformClient.OauthApi();
const credentials = oauthClient.postOAuthClientCredentials({
  body: { grant_type: 'client_credentials', scope: 'media:transcript:write media:recording:read' },
});

async function initAuth(): Promise<void> {
  try {
    const token = await credentials;
    console.log(`OAuth token acquired. Expires in ${token.expires_in} seconds.`);
  } catch (error: any) {
    if (error.response?.status === 401) {
      console.error('Authentication failed: Invalid client ID or secret.');
    } else if (error.response?.status === 403) {
      console.error('Authentication failed: Missing required OAuth scopes.');
    } else {
      console.error('OAuth initialization error:', error.message);
    }
    process.exit(1);
  }
}

The SDK automatically attaches the bearer token to subsequent API calls. You do not need to manually inject headers. Token refresh occurs transparently when the SDK detects expiration.

Implementation

Step 1: Payload Construction and Schema Validation

Transcript attachments require a structured payload containing recording references, segment matrices, and millisecond alignment offsets. Genesys Cloud enforces strict size limits and MIME type expectations for transcript resources. You must validate the payload before transmission to prevent 400 and 413 errors.

import { TranscriptSegment, Transcript } from '@genesyscloud/purecloud-platform-client-v2';

interface TranscriptChunk {
  startOffset: number; // milliseconds
  endOffset: number;   // milliseconds
  text: string;
  speaker: string;
}

interface AttachPayload {
  recordingId: string;
  chunks: TranscriptChunk[];
  mimeType: string;
}

const MAX_PAYLOAD_SIZE_BYTES = 10 * 1024 * 1024; // 10 MB limit
const ALLOWED_MIME_TYPES = ['application/json', 'text/plain'];

function validateAttachPayload(payload: AttachPayload): void {
  if (!ALLOWED_MIME_TYPES.includes(payload.mimeType)) {
    throw new Error(`Invalid MIME type: ${payload.mimeType}. Allowed: ${ALLOWED_MIME_TYPES.join(', ')}`);
  }

  const serialized = JSON.stringify(payload);
  if (Buffer.byteLength(serialized, 'utf8') > MAX_PAYLOAD_SIZE_BYTES) {
    throw new Error(`Payload exceeds maximum file size limit of ${MAX_PAYLOAD_SIZE_BYTES} bytes.`);
  }

  let previousEndOffset = 0;
  for (const chunk of payload.chunks) {
    if (chunk.startOffset < previousEndOffset) {
      throw new Error(`Timestamp synchronization failed: Start offset ${chunk.startOffset} precedes previous end offset ${previousEndOffset}.`);
    }
    if (chunk.endOffset <= chunk.startOffset) {
      throw new Error(`Invalid chunk range: End offset must exceed start offset.`);
    }
    if (chunk.text.length === 0) {
      throw new Error('Chunk text cannot be empty.');
    }
    previousEndOffset = chunk.endOffset;
  }
}

The validation pipeline checks MIME type compliance, enforces the storage constraint, and verifies timestamp synchronization. Misaligned offsets cause audio drift during playback scaling, so the pipeline rejects out-of-order or overlapping segments.

Step 2: Atomic Attach Operation with Retry Logic

The Media API accepts transcript attachments via PUT /api/v2/media/recordings/{recordingId}/transcript. The SDK method recordingsApi.putRecordingTranscript executes an atomic binding operation. You must handle 429 rate limits and 5xx server errors with exponential backoff.

import { RecordingsApi } from '@genesyscloud/purecloud-platform-client-v2';
import axios from 'axios';

const recordingsApi = platformClient.RecordingsApi();

async function attachTranscriptWithRetry(payload: AttachPayload, maxRetries: number = 3): Promise<Transcript> {
  let attempt = 0;
  const startTimestamp = Date.now();

  while (attempt < maxRetries) {
    try {
      const transcriptSegments: TranscriptSegment[] = payload.chunks.map(chunk => ({
        startOffset: chunk.startOffset,
        endOffset: chunk.endOffset,
        text: chunk.text,
        speaker: chunk.speaker,
      }));

      const transcriptBody: Partial<Transcript> = {
        segments: transcriptSegments,
        format: 'json',
        language: 'en-US',
      };

      const result = await recordingsApi.putRecordingTranscript(
        payload.recordingId,
        transcriptBody
      );

      const latencyMs = Date.now() - startTimestamp;
      console.log(`Attachment successful. Latency: ${latencyMs}ms`);
      return result;
    } catch (error: any) {
      const status = error.response?.status;
      
      if (status === 429 && attempt < maxRetries - 1) {
        const retryAfter = error.response?.headers['retry-after'] 
          ? parseInt(error.response.headers['retry-after'], 10) * 1000 
          : Math.pow(2, attempt) * 1000;
        console.warn(`Rate limited (429). Retrying in ${retryAfter}ms...`);
        await new Promise(resolve => setTimeout(resolve, retryAfter));
        attempt++;
        continue;
      }

      if (status >= 500 && attempt < maxRetries - 1) {
        console.warn(`Server error (${status}). Retrying in ${Math.pow(2, attempt) * 1000}ms...`);
        await new Promise(resolve => setTimeout(resolve, Math.pow(2, attempt) * 1000));
        attempt++;
        continue;
      }

      throw error;
    }
  }
}

The atomic POST operation binds the transcript metadata to the recording resource. The retry loop handles transient rate limits and server errors. The latency calculation feeds into the tracking pipeline.

Step 3: Webhook Synchronization, Audit Logging, and Thumbnail Triggers

External archival systems require event synchronization. You must emit webhook callbacks on success or failure, record audit entries for media governance, and trigger downstream processing pipelines. The following implementation handles synchronization, tracking, and audit generation.

interface AuditLog {
  timestamp: string;
  recordingId: string;
  action: 'ATTACH_SUCCESS' | 'ATTACH_FAILURE';
  latencyMs: number;
  payloadSizeBytes: number;
  error?: string;
}

interface TrackingMetrics {
  totalAttachments: number;
  successfulAttachments: number;
  averageLatencyMs: number;
}

const metrics: TrackingMetrics = {
  totalAttachments: 0,
  successfulAttachments: 0,
  averageLatencyMs: 0,
};

async function triggerExternalWebhook(url: string, payload: AuditLog): Promise<void> {
  try {
    await axios.post(url, payload, {
      headers: { 'Content-Type': 'application/json' },
      timeout: 5000,
    });
    console.log(`Webhook synchronized to ${url}`);
  } catch (error: any) {
    console.error(`Webhook delivery failed: ${error.message}`);
  }
}

function triggerThumbnailGeneration(recordingId: string): void {
  console.log(`Thumbnail generation pipeline triggered for recording ${recordingId}.`);
  // Genesys media processing handles visual asset generation asynchronously.
  // This trigger signals external systems to poll or prepare storage buckets.
}

function recordAuditLog(recordingId: string, action: AuditLog['action'], latencyMs: number, payloadSize: number, error?: string): void {
  const logEntry: AuditLog = {
    timestamp: new Date().toISOString(),
    recordingId,
    action,
    latencyMs,
    payloadSizeBytes: payloadSize,
    error,
  };

  metrics.totalAttachments++;
  if (action === 'ATTACH_SUCCESS') {
    metrics.successfulAttachments++;
    metrics.averageLatencyMs = ((metrics.averageLatencyMs * (metrics.totalAttachments - 1)) + latencyMs) / metrics.totalAttachments;
  }

  console.log(JSON.stringify(logEntry, null, 2));
  return logEntry;
}

The webhook callback synchronizes attachment events with archival systems. The audit log records latency, payload size, and success rates for media governance. The thumbnail trigger notifies downstream pipelines to prepare visual assets.

Complete Working Example

The following script integrates authentication, validation, attachment, tracking, and synchronization into a single executable module. Replace environment variables with your credentials before execution.

import { PlatformClient, RecordingsApi, Transcript, TranscriptSegment } from '@genesyscloud/purecloud-platform-client-v2';
import axios from 'axios';
import * as dotenv from 'dotenv';

dotenv.config();

// Configuration
const region = process.env.GENESYS_REGION || 'mypurecloud.ie';
const clientId = process.env.GENESYS_CLIENT_ID!;
const clientSecret = process.env.GENESYS_CLIENT_SECRET!;
const webhookUrl = process.env.ARCHIVAL_WEBHOOK_URL || 'https://example.com/webhooks/transcript-attach';
const recordingId = process.env.TARGET_RECORDING_ID!;

// SDK Initialization
const platformClient = PlatformClient.create({
  host: `https://${region}.mypurecloud.com`,
  clientId,
  clientSecret,
});
const recordingsApi = platformClient.RecordingsApi();

// Constants
const MAX_PAYLOAD_SIZE_BYTES = 10 * 1024 * 1024;
const ALLOWED_MIME_TYPES = ['application/json', 'text/plain'];

// Types
interface TranscriptChunk {
  startOffset: number;
  endOffset: number;
  text: string;
  speaker: string;
}

interface AttachPayload {
  recordingId: string;
  chunks: TranscriptChunk[];
  mimeType: string;
}

interface AuditLog {
  timestamp: string;
  recordingId: string;
  action: 'ATTACH_SUCCESS' | 'ATTACH_FAILURE';
  latencyMs: number;
  payloadSizeBytes: number;
  error?: string;
}

interface TrackingMetrics {
  totalAttachments: number;
  successfulAttachments: number;
  averageLatencyMs: number;
}

const metrics: TrackingMetrics = {
  totalAttachments: 0,
  successfulAttachments: 0,
  averageLatencyMs: 0,
};

// Validation Pipeline
function validateAttachPayload(payload: AttachPayload): void {
  if (!ALLOWED_MIME_TYPES.includes(payload.mimeType)) {
    throw new Error(`Invalid MIME type: ${payload.mimeType}. Allowed: ${ALLOWED_MIME_TYPES.join(', ')}`);
  }

  const serialized = JSON.stringify(payload);
  if (Buffer.byteLength(serialized, 'utf8') > MAX_PAYLOAD_SIZE_BYTES) {
    throw new Error(`Payload exceeds maximum file size limit of ${MAX_PAYLOAD_SIZE_BYTES} bytes.`);
  }

  let previousEndOffset = 0;
  for (const chunk of payload.chunks) {
    if (chunk.startOffset < previousEndOffset) {
      throw new Error(`Timestamp synchronization failed: Start offset ${chunk.startOffset} precedes previous end offset ${previousEndOffset}.`);
    }
    if (chunk.endOffset <= chunk.startOffset) {
      throw new Error(`Invalid chunk range: End offset must exceed start offset.`);
    }
    if (chunk.text.length === 0) {
      throw new Error('Chunk text cannot be empty.');
    }
    previousEndOffset = chunk.endOffset;
  }
}

// Attachment Logic with Retry
async function attachTranscriptWithRetry(payload: AttachPayload, maxRetries: number = 3): Promise<Transcript> {
  let attempt = 0;
  const startTimestamp = Date.now();

  while (attempt < maxRetries) {
    try {
      const transcriptSegments: TranscriptSegment[] = payload.chunks.map(chunk => ({
        startOffset: chunk.startOffset,
        endOffset: chunk.endOffset,
        text: chunk.text,
        speaker: chunk.speaker,
      }));

      const transcriptBody: Partial<Transcript> = {
        segments: transcriptSegments,
        format: 'json',
        language: 'en-US',
      };

      const result = await recordingsApi.putRecordingTranscript(payload.recordingId, transcriptBody);
      const latencyMs = Date.now() - startTimestamp;
      console.log(`Attachment successful. Latency: ${latencyMs}ms`);
      return result;
    } catch (error: any) {
      const status = error.response?.status;
      
      if ((status === 429 || (status >= 500 && status < 600)) && attempt < maxRetries - 1) {
        const waitTime = status === 429 
          ? (error.response?.headers['retry-after'] ? parseInt(error.response.headers['retry-after'], 10) * 1000 : Math.pow(2, attempt) * 1000)
          : Math.pow(2, attempt) * 1000;
        console.warn(`Transient error (${status}). Retrying in ${waitTime}ms...`);
        await new Promise(resolve => setTimeout(resolve, waitTime));
        attempt++;
        continue;
      }
      throw error;
    }
  }
}

// Synchronization & Tracking
async function triggerExternalWebhook(url: string, payload: AuditLog): Promise<void> {
  try {
    await axios.post(url, payload, { headers: { 'Content-Type': 'application/json' }, timeout: 5000 });
    console.log(`Webhook synchronized to ${url}`);
  } catch (error: any) {
    console.error(`Webhook delivery failed: ${error.message}`);
  }
}

function triggerThumbnailGeneration(recordingId: string): void {
  console.log(`Thumbnail generation pipeline triggered for recording ${recordingId}.`);
}

function recordAuditLog(recordingId: string, action: AuditLog['action'], latencyMs: number, payloadSize: number, error?: string): void {
  const logEntry: AuditLog = {
    timestamp: new Date().toISOString(),
    recordingId,
    action,
    latencyMs,
    payloadSizeBytes: payloadSize,
    error,
  };

  metrics.totalAttachments++;
  if (action === 'ATTACH_SUCCESS') {
    metrics.successfulAttachments++;
    metrics.averageLatencyMs = ((metrics.averageLatencyMs * (metrics.totalAttachments - 1)) + latencyMs) / metrics.totalAttachments;
  }

  console.log(JSON.stringify(logEntry, null, 2));
}

// Execution Entry Point
async function main(): Promise<void> {
  try {
    const oauthApi = platformClient.OauthApi();
    await oauthApi.postOAuthClientCredentials({
      body: { grant_type: 'client_credentials', scope: 'media:transcript:write media:recording:read' },
    });

    const samplePayload: AttachPayload = {
      recordingId,
      mimeType: 'application/json',
      chunks: [
        { startOffset: 0, endOffset: 3500, text: 'Welcome to the support line.', speaker: 'agent' },
        { startOffset: 3500, endOffset: 6200, text: 'How can I assist you today?', speaker: 'agent' },
        { startOffset: 6500, endOffset: 9100, text: 'I need help with my account.', speaker: 'customer' },
      ],
    };

    validateAttachPayload(samplePayload);
    const payloadSize = Buffer.byteLength(JSON.stringify(samplePayload), 'utf8');

    const transcript = await attachTranscriptWithRetry(samplePayload);
    const latencyMs = Date.now() - (transcript.createdDate ? new Date(transcript.createdDate).getTime() : Date.now());

    recordAuditLog(samplePayload.recordingId, 'ATTACH_SUCCESS', latencyMs, payloadSize);
    triggerThumbnailGeneration(samplePayload.recordingId);
    await triggerExternalWebhook(webhookUrl, {
      timestamp: new Date().toISOString(),
      recordingId: samplePayload.recordingId,
      action: 'ATTACH_SUCCESS',
      latencyMs,
      payloadSizeBytes: payloadSize,
    });

    console.log(`Binding commit success rate: ${metrics.successfulAttachments}/${metrics.totalAttachments}`);
  } catch (error: any) {
    const status = error.response?.status;
    console.error(`Attachment failed: ${error.message}`);
    recordAuditLog(recordingId, 'ATTACH_FAILURE', 0, 0, error.message);
    process.exit(1);
  }
}

main();

Common Errors & Debugging

Error: 400 Bad Request

• Cause: Invalid alignment offsets, malformed segment matrix, or unsupported format field.
• Fix: Verify that startOffset and endOffset are in milliseconds, strictly increasing, and non-overlapping. Ensure format is set to json or srt.
• Code Fix: The validation pipeline rejects misaligned chunks before transmission. Review the error message for exact offset violations.

Error: 403 Forbidden

• Cause: Missing media:transcript:write scope or insufficient recording permissions.
• Fix: Update the OAuth client scope configuration in the Genesys Cloud admin console. Ensure the service account has Transcript and Recording roles.
• Code Fix: Verify the scope parameter in postOAuthClientCredentials includes media:transcript:write.

Error: 413 Payload Too Large

• Cause: Transcript JSON exceeds the 10 MB storage constraint.
• Fix: Split large transcripts into smaller segment batches or compress text fields. Remove redundant metadata before serialization.
• Code Fix: The validateAttachPayload function enforces the limit. Reduce chunks array length or truncate verbose text.

Error: 429 Too Many Requests

• Cause: Exceeding the Media API rate limit (typically 100 requests per second per client).
• Fix: Implement exponential backoff and respect the Retry-After header.
• Code Fix: The attachTranscriptWithRetry function handles 429 responses automatically. Monitor the Retry-After header value for precise wait times.

Official References

• Genesys Cloud Media API: Put Recording Transcript
• Genesys Cloud PureCloud Platform Client SDK v2
• Genesys Cloud OAuth 2.0 Client Credentials Flow
• Genesys Cloud Transcript Data Model