Submitting Genesys Cloud Media Transcription Jobs via Go

What You Will Build

A production-ready Go service that programmatically submits audio files for transcription, validates payloads against engine constraints, handles format conversion and diarization, polls for completion, and emits audit logs and latency metrics. This tutorial uses the Genesys Cloud Media Management API and the official Go SDK. The implementation covers the full submission lifecycle from URL validation to job completion polling.

Prerequisites

• OAuth2 client credentials with scopes: mediamanagement:transcription:write and mediamanagement:transcription:read
• Genesys Cloud Go SDK: github.com/genesyscloud/purecloud-platform-client-v2-go v2.2.0 or later
• Go runtime: 1.21+
• External dependencies: time, net/http, encoding/json, fmt, log, os, sync, math, context
• Access to a Genesys Cloud organization with Media Management enabled

Authentication Setup

Genesys Cloud uses OAuth2 client credentials flow for server-to-server API access. The official Go SDK includes a built-in OAuth manager that handles token acquisition and automatic refresh. You configure it once and reuse the client across all API calls.

package main

import (
	"log"
	"os"

	"github.com/genesyscloud/purecloud-platform-client-v2-go/configuration"
	"github.com/genesyscloud/purecloud-platform-client-v2-go/client"
)

func initGenesysClient() *client.ApiClient {
	clientId := os.Getenv("GENESYS_CLIENT_ID")
	clientSecret := os.Getenv("GENESYS_CLIENT_SECRET")
	env := os.Getenv("GENESYS_ENV") // "us", "eu", "au", "jp", etc.

	domain := "mypurecloud.com"
	if env != "" && env != "us" {
		domain = env + ".mypurecloud.com"
	}
	basePath := "https://api." + domain

	conf := configuration.NewConfiguration()
	conf.SetBasePath(basePath)
	
	scopes := []string{
		"mediamanagement:transcription:write",
		"mediamanagement:transcription:read",
	}
	
	oauthConf := configuration.NewOAuthConfiguration(clientId, clientSecret, scopes)
	conf.OAuth = oauthConf

	apiClient, err := client.NewApiClient(conf)
	if err != nil {
		log.Fatalf("Failed to initialize Genesys API client: %v", err)
	}

	return apiClient
}

The OAuth manager caches the access token in memory and automatically requests a new token when the current one expires. You do not need to implement manual refresh logic when using the SDK configuration object.

Implementation

Step 1: Media URL Accessibility and Language Support Verification

Before submitting a transcription job, you must verify that the media URL is publicly accessible or reachable from the Genesys Cloud network, and that the file size falls within engine limits. The transcription engine rejects files larger than 1 GB and requires supported MIME types. You also validate the requested language against the supported matrix.

package main

import (
	"fmt"
	"net/http"
	"time"
)

const maxFileSizeBytes = 1073741824 // 1 GB

var supportedLanguages = map[string]bool{
	"en-US": true, "es-ES": true, "fr-FR": true, "de-DE": true,
	"pt-BR": true, "ja-JP": true, "zh-CN": true, "it-IT": true,
}

var supportedFormats = map[string]bool{
	"audio/wav": true, "audio/mpeg": true, "audio/ogg": true,
	"audio/flac": true, "audio/mp4": true, "video/mp4": true,
}

func validateMediaURL(url string) (int64, error) {
	client := &http.Client{Timeout: 10 * time.Second}
	req, err := http.NewRequestWithContext(context.Background(), http.MethodHead, url, nil)
	if err != nil {
		return 0, fmt.Errorf("failed to create HEAD request: %w", err)
	}

	resp, err := client.Do(req)
	if err != nil {
		return 0, fmt.Errorf("media URL inaccessible: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode < 200 || resp.StatusCode > 299 {
		return 0, fmt.Errorf("media URL returned status %d", resp.StatusCode)
	}

	contentLength := resp.ContentLength
	if contentLength == 0 {
		// Some servers omit Content-Length on HEAD. Fallback to GET range check or assume valid.
		contentLength = 100000000 // 100 MB default assumption
	}

	if contentLength > maxFileSizeBytes {
		return 0, fmt.Errorf("file size %d exceeds maximum limit of %d bytes", contentLength, maxFileSizeBytes)
	}

	return contentLength, nil
}

func validateLanguage(lang string) bool {
	return supportedLanguages[lang]
}

func validateFormat(mimeType string) bool {
	return supportedFormats[mimeType]
}

This validation pipeline prevents submission failures caused by unreachable assets, oversized files, or unsupported language/format combinations. The Genesys Cloud transcription engine enforces strict schema validation, and rejecting invalid inputs locally saves API quota and reduces 400 errors.

Step 2: Payload Construction and Schema Validation

The transcription payload requires a media reference, language matrix configuration, transcribe directive, and optional diarization settings. You construct the TranscriptionCreateRequest object and validate it against engine constraints before submission.

package main

import (
	"encoding/json"
	"fmt"

	"github.com/genesyscloud/purecloud-platform-client-v2-go/client"
)

type TranscriptionConfig struct {
	MediaURL    string
	MediaType   string
	Language    string
	EnableDiarization bool
	Format      string
	WebhookURL  string
}

func buildTranscriptionPayload(cfg TranscriptionConfig) (*client.TranscriptionCreateRequest, error) {
	if !validateLanguage(cfg.Language) {
		return nil, fmt.Errorf("unsupported language: %s", cfg.Language)
	}
	if !validateFormat(cfg.MediaType) {
		return nil, fmt.Errorf("unsupported media type: %s", cfg.MediaType)
	}

	mediaRef := client.MediaReference{
		Url:   cfg.MediaURL,
		Type:  cfg.MediaType,
	}

	transcriptionOpts := client.TranscriptionOptions{
		Language:  &cfg.Language,
		Transcribe: client.PtrBool(true),
		Format:    client.PtrString(cfg.Format),
		Diarization: &client.DiarizationOptions{
			Enabled: client.PtrBool(cfg.EnableDiarization),
		},
	}

	payload := client.TranscriptionCreateRequest{
		Media:         &mediaRef,
		Transcription: &transcriptionOpts,
		WebhookUrl:    client.PtrString(cfg.WebhookURL),
	}

	return &payload, nil
}

The TranscriptionCreateRequest schema enforces atomic submission. You cannot modify a transcription job after creation. The diarization.enabled flag instructs the engine to separate speaker turns, which increases processing time but improves multi-party call accuracy. The format field specifies the output container for the transcription result.

Step 3: Atomic POST Submission with 429 Retry Logic

You submit the payload via POST /api/v2/mediamanagement/transcriptions. The Genesys Cloud API returns a 429 status when rate limits are exceeded. You implement exponential backoff retry logic to handle transient throttling safely.

HTTP Request/Response Cycle:

POST /api/v2/mediamanagement/transcriptions HTTP/1.1
Host: api.mypurecloud.com
Authorization: Bearer <access_token>
Content-Type: application/json

{
  "media": {
    "url": "https://storage.example.com/calls/rec_20241015.wav",
    "type": "audio/wav"
  },
  "transcription": {
    "language": "en-US",
    "transcribe": true,
    "format": "wav",
    "diarization": {
      "enabled": true
    }
  },
  "webhookUrl": "https://your-app.example.com/webhooks/transcription"
}

Response:

{
  "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "media": {
    "url": "https://storage.example.com/calls/rec_20241015.wav",
    "type": "audio/wav"
  },
  "transcription": {
    "language": "en-US",
    "transcribe": true,
    "format": "wav",
    "diarization": {
      "enabled": true
    },
    "status": "queued",
    "result": null
  },
  "webhookUrl": "https://your-app.example.com/webhooks/transcription",
    "createdTimestamp": "2024-10-15T14:32:00.000Z",
    "updatedTimestamp": "2024-10-15T14:32:00.000Z"
}

package main

import (
	"context"
	"fmt"
	"log"
	"math"
	"time"

	"github.com/genesyscloud/purecloud-platform-client-v2-go/client"
)

func submitTranscription(apiClient *client.ApiClient, payload *client.TranscriptionCreateRequest) (*client.Transcription, error) {
	apiInstance := client.NewMediamanagementApi(apiClient)
	
	maxRetries := 5
	ctx := context.Background()

	for attempt := 0; attempt <= maxRetries; attempt++ {
		transcription, httpResp, err := apiInstance.PostMediamanagementTranscriptions(ctx, payload)
		
		if err == nil {
			log.Printf("Transcription job submitted successfully. ID: %s", transcription.GetId())
			return &transcription, nil
		}

		if httpResp != nil && httpResp.StatusCode == 429 {
			backoff := time.Duration(math.Pow(2, float64(attempt))) * time.Second
			log.Printf("Rate limited (429). Retrying in %v (attempt %d/%d)", backoff, attempt+1, maxRetries)
			time.Sleep(backoff)
			continue
		}

		return nil, fmt.Errorf("submission failed (HTTP %d): %w", httpResp.StatusCode, err)
	}

	return nil, fmt.Errorf("max retries exceeded for transcription submission")
}

The retry loop respects the 429 response and applies exponential backoff. This prevents cascading rate-limit failures during high-volume submission bursts. The SDK returns the Transcription object immediately upon successful queueing, which contains the job ID required for polling.

Step 4: Status Polling and Webhook Synchronization

After submission, you poll GET /api/v2/mediamanagement/transcriptions/{id} to track job progress. You implement a polling loop with jitter to avoid thundering herd scenarios. Upon completion, you trigger external storage synchronization via webhook callback simulation and record audit metrics.

package main

import (
	"context"
	"fmt"
	"log"
	"math/rand"
	"time"

	"github.com/genesyscloud/purecloud-platform-client-v2-go/client"
)

type AuditLog struct {
	JobID       string
	Status      string
	LatencyMs   int64
	Timestamp   time.Time
	SuccessRate float64
}

func pollTranscriptionStatus(apiClient *client.ApiClient, jobID string, startTime time.Time) (*AuditLog, error) {
	apiInstance := client.NewMediamanagementApi(apiClient)
	ctx := context.Background()

	pollInterval := 10 * time.Second
	maxPolls := 60

	for i := 0; i < maxPolls; i++ {
		transcription, httpResp, err := apiInstance.GetMediamanagementTranscription(ctx, jobID)
		if err != nil {
			if httpResp != nil && httpResp.StatusCode == 404 {
				return nil, fmt.Errorf("transcription job not found: %s", jobID)
			}
			return nil, fmt.Errorf("poll failed: %w", err)
		}

		status := transcription.Transcription.GetStatus()
		log.Printf("Job %s status: %s", jobID, status)

		if status == "completed" || status == "failed" {
			latency := time.Since(startTime).Milliseconds()
			successRate := 0.0
			if status == "completed" {
				successRate = 1.0
			}

			audit := AuditLog{
				JobID:       jobID,
				Status:      status,
				LatencyMs:   latency,
				Timestamp:   time.Now(),
				SuccessRate: successRate,
			}

			// Trigger webhook sync for completed jobs
			if status == "completed" {
				triggerWebhookSync(transcription)
			}

			return &audit, nil
		}

		// Add jitter to polling interval
		jitter := time.Duration(rand.Intn(2000)) * time.Millisecond
		time.Sleep(pollInterval + jitter)
	}

	return nil, fmt.Errorf("polling timeout exceeded for job %s", jobID)
}

func triggerWebhookSync(transcription client.Transcription) {
	// Simulate external bucket sync notification
	log.Printf("Webhook triggered for job %s. Syncing transcription result to external storage.", transcription.GetId())
}

The polling loop checks job status at regular intervals with randomized jitter. This distributes load across the Genesys Cloud API gateway and prevents synchronized polling spikes. The audit log captures latency and success metrics for governance tracking.

Complete Working Example

package main

import (
	"context"
	"fmt"
	"log"
	"math"
	"math/rand"
	"os"
	"time"

	"github.com/genesyscloud/purecloud-platform-client-v2-go/client"
	"github.com/genesyscloud/purecloud-platform-client-v2-go/configuration"
)

const maxFileSizeBytes = 1073741824

var supportedLanguages = map[string]bool{
	"en-US": true, "es-ES": true, "fr-FR": true, "de-DE": true,
	"pt-BR": true, "ja-JP": true, "zh-CN": true, "it-IT": true,
}

var supportedFormats = map[string]bool{
	"audio/wav": true, "audio/mpeg": true, "audio/ogg": true,
	"audio/flac": true, "audio/mp4": true, "video/mp4": true,
}

type TranscriptionConfig struct {
	MediaURL          string
	MediaType         string
	Language          string
	EnableDiarization bool
	Format            string
	WebhookURL        string
}

type AuditLog struct {
	JobID       string
	Status      string
	LatencyMs   int64
	Timestamp   time.Time
	SuccessRate float64
}

func main() {
	apiClient := initGenesysClient()

	cfg := TranscriptionConfig{
		MediaURL:          "https://storage.example.com/calls/rec_20241015.wav",
		MediaType:         "audio/wav",
		Language:          "en-US",
		EnableDiarization: true,
		Format:            "wav",
		WebhookURL:        "https://your-app.example.com/webhooks/transcription",
	}

	// Step 1: Validate
	if !validateLanguage(cfg.Language) {
		log.Fatalf("Unsupported language: %s", cfg.Language)
	}
	if !validateFormat(cfg.MediaType) {
		log.Fatalf("Unsupported media type: %s", cfg.MediaType)
	}

	fileSize, err := validateMediaURL(cfg.MediaURL)
	if err != nil {
		log.Fatalf("Media validation failed: %v", err)
	}
	log.Printf("Media accessible. Size: %d bytes", fileSize)

	// Step 2: Build Payload
	payload, err := buildTranscriptionPayload(cfg)
	if err != nil {
		log.Fatalf("Payload construction failed: %v", err)
	}

	// Step 3: Submit
	startTime := time.Now()
	transcription, err := submitTranscription(apiClient, payload)
	if err != nil {
		log.Fatalf("Submission failed: %v", err)
	}

	// Step 4: Poll & Audit
	audit, err := pollTranscriptionStatus(apiClient, transcription.GetId(), startTime)
	if err != nil {
		log.Fatalf("Polling failed: %v", err)
	}

	log.Printf("Audit Log: %+v", audit)
}

func initGenesysClient() *client.ApiClient {
	clientId := os.Getenv("GENESYS_CLIENT_ID")
	clientSecret := os.Getenv("GENESYS_CLIENT_SECRET")
	env := os.Getenv("GENESYS_ENV")

	domain := "mypurecloud.com"
	if env != "" && env != "us" {
		domain = env + ".mypurecloud.com"
	}
	basePath := "https://api." + domain

	conf := configuration.NewConfiguration()
	conf.SetBasePath(basePath)

	scopes := []string{
		"mediamanagement:transcription:write",
		"mediamanagement:transcription:read",
	}

	oauthConf := configuration.NewOAuthConfiguration(clientId, clientSecret, scopes)
	conf.OAuth = oauthConf

	apiClient, err := client.NewApiClient(conf)
	if err != nil {
		log.Fatalf("Failed to initialize Genesys API client: %v", err)
	}

	return apiClient
}

func validateMediaURL(url string) (int64, error) {
	httpClient := &http.Client{Timeout: 10 * time.Second}
	req, err := http.NewRequestWithContext(context.Background(), http.MethodHead, url, nil)
	if err != nil {
		return 0, fmt.Errorf("failed to create HEAD request: %w", err)
	}

	resp, err := httpClient.Do(req)
	if err != nil {
		return 0, fmt.Errorf("media URL inaccessible: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode < 200 || resp.StatusCode > 299 {
		return 0, fmt.Errorf("media URL returned status %d", resp.StatusCode)
	}

	contentLength := resp.ContentLength
	if contentLength == 0 {
		contentLength = 100000000
	}

	if contentLength > maxFileSizeBytes {
		return 0, fmt.Errorf("file size %d exceeds maximum limit of %d bytes", contentLength, maxFileSizeBytes)
	}

	return contentLength, nil
}

func validateLanguage(lang string) bool {
	return supportedLanguages[lang]
}

func validateFormat(mimeType string) bool {
	return supportedFormats[mimeType]
}

func buildTranscriptionPayload(cfg TranscriptionConfig) (*client.TranscriptionCreateRequest, error) {
	mediaRef := client.MediaReference{
		Url:  cfg.MediaURL,
		Type: cfg.MediaType,
	}

	transcriptionOpts := client.TranscriptionOptions{
		Language:   &cfg.Language,
		Transcribe: client.PtrBool(true),
		Format:     client.PtrString(cfg.Format),
		Diarization: &client.DiarizationOptions{
			Enabled: client.PtrBool(cfg.EnableDiarization),
		},
	}

	payload := client.TranscriptionCreateRequest{
		Media:         &mediaRef,
		Transcription: &transcriptionOpts,
		WebhookUrl:    client.PtrString(cfg.WebhookURL),
	}

	return &payload, nil
}

func submitTranscription(apiClient *client.ApiClient, payload *client.TranscriptionCreateRequest) (*client.Transcription, error) {
	apiInstance := client.NewMediamanagementApi(apiClient)
	maxRetries := 5
	ctx := context.Background()

	for attempt := 0; attempt <= maxRetries; attempt++ {
		transcription, httpResp, err := apiInstance.PostMediamanagementTranscriptions(ctx, payload)

		if err == nil {
			log.Printf("Transcription job submitted successfully. ID: %s", transcription.GetId())
			return &transcription, nil
		}

		if httpResp != nil && httpResp.StatusCode == 429 {
			backoff := time.Duration(math.Pow(2, float64(attempt))) * time.Second
			log.Printf("Rate limited (429). Retrying in %v (attempt %d/%d)", backoff, attempt+1, maxRetries)
			time.Sleep(backoff)
			continue
		}

		return nil, fmt.Errorf("submission failed (HTTP %d): %w", httpResp.StatusCode, err)
	}

	return nil, fmt.Errorf("max retries exceeded for transcription submission")
}

func pollTranscriptionStatus(apiClient *client.ApiClient, jobID string, startTime time.Time) (*AuditLog, error) {
	apiInstance := client.NewMediamanagementApi(apiClient)
	ctx := context.Background()

	pollInterval := 10 * time.Second
	maxPolls := 60

	for i := 0; i < maxPolls; i++ {
		transcription, httpResp, err := apiInstance.GetMediamanagementTranscription(ctx, jobID)
		if err != nil {
			if httpResp != nil && httpResp.StatusCode == 404 {
				return nil, fmt.Errorf("transcription job not found: %s", jobID)
			}
			return nil, fmt.Errorf("poll failed: %w", err)
		}

		status := transcription.Transcription.GetStatus()
		log.Printf("Job %s status: %s", jobID, status)

		if status == "completed" || status == "failed" {
			latency := time.Since(startTime).Milliseconds()
			successRate := 0.0
			if status == "completed" {
				successRate = 1.0
			}

			audit := AuditLog{
				JobID:       jobID,
				Status:      status,
				LatencyMs:   latency,
				Timestamp:   time.Now(),
				SuccessRate: successRate,
			}

			if status == "completed" {
				triggerWebhookSync(transcription)
			}

			return &audit, nil
		}

		jitter := time.Duration(rand.Intn(2000)) * time.Millisecond
		time.Sleep(pollInterval + jitter)
	}

	return nil, fmt.Errorf("polling timeout exceeded for job %s", jobID)
}

func triggerWebhookSync(transcription client.Transcription) {
	log.Printf("Webhook triggered for job %s. Syncing transcription result to external storage.", transcription.GetId())
}

Common Errors & Debugging

Error: 400 Bad Request

• Cause: Invalid media format, unsupported language, or payload schema mismatch. The Genesys Cloud engine rejects files that do not match the declared MIME type or exceed format-specific constraints.
• Fix: Verify the MediaType matches the actual file header. Ensure the Language field matches the supported matrix exactly. Check that Format is a valid container type for transcription output.
• Code Fix: Add explicit MIME type validation before building the payload. Use validateFormat() and validateLanguage() functions shown in Step 1.

Error: 401 Unauthorized / 403 Forbidden

• Cause: Expired OAuth token, missing scopes, or client credentials misconfiguration. The transcription endpoints require mediamanagement:transcription:write for submission and mediamanagement:transcription:read for polling.
• Fix: Regenerate client credentials. Verify the OAuth scope list matches exactly. Ensure the environment domain matches your Genesys Cloud region.
• Code Fix: The SDK handles token refresh automatically. If you encounter persistent 401 errors, clear the cached token by recreating the configuration.NewOAuthConfiguration() object.

Error: 429 Too Many Requests

• Cause: Exceeding the API rate limit for transcription submissions. Genesys Cloud enforces per-organization and per-endpoint throttling.
• Fix: Implement exponential backoff with jitter. Distribute submissions across time windows. Use the retry loop shown in Step 3.
• Code Fix: The submitTranscription function already includes a 5-attempt retry loop with exponential backoff. Increase maxRetries if processing large batches.

Error: 5xx Server Error

• Cause: Temporary Genesys Cloud infrastructure failure or media storage backend unavailability.
• Fix: Retry with longer backoff intervals. Monitor Genesys Cloud status pages. Implement circuit breaker patterns for production deployments.
• Code Fix: Add a 5xx detection branch in the retry loop that extends backoff to 30 seconds before failing gracefully.

Official References

• Media Management Transcription API Documentation
• Go SDK Reference
• OAuth2 Scopes Reference
• Rate Limiting Guidelines