Enabling Genesys Cloud Client SDK Transcription Streams via C#

What You Will Build

This tutorial builds a production-grade C# module that programmatically enables real-time transcription streams on active Genesys Cloud conversations. The code uses the PureCloudPlatformClientV2 SDK to construct enable payloads with channel identifiers, language code matrices, and redaction directives. It validates configurations against engine constraints, verifies service availability and license entitlements, executes atomic activation, synchronizes with external processors via callbacks, tracks latency and success rates, generates audit logs, and exposes a reusable enabler interface.

Prerequisites

• Genesys Cloud OAuth confidential client with scopes: conversation:transcription:modify, platformservices:transcription:view, organization:read
• .NET 8 SDK
• PureCloudPlatformClientV2 (version 130.0.0 or newer)
• System.Text.Json, System.Net.Http, Microsoft.Extensions.Logging.Abstractions
• Active Genesys Cloud organization with Real-Time Transcription enabled

Authentication Setup

Genesys Cloud APIs require Bearer token authentication. The following code implements the OAuth 2.0 Client Credentials flow with token caching and automatic refresh logic. The SDK Configuration object accepts the token directly.

using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Text.Json;
using System.Threading.Tasks;
using PureCloudPlatformClientV2.Client;

public class GenesysAuthManager
{
    private readonly string _clientId;
    private readonly string _clientSecret;
    private readonly string _environment;
    private string _accessToken;
    private DateTime _tokenExpiry;
    private readonly HttpClient _httpClient;

    public GenesysAuthManager(string clientId, string clientSecret, string environment = "us-east-1")
    {
        _clientId = clientId;
        _clientSecret = clientSecret;
        _environment = environment;
        _httpClient = new HttpClient();
        _httpClient.Timeout = TimeSpan.FromSeconds(10);
    }

    public async Task<string> GetAccessTokenAsync()
    {
        if (!string.IsNullOrEmpty(_accessToken) && DateTime.UtcNow < _tokenExpiry)
        {
            return _accessToken;
        }

        var tokenEndpoint = $"https://login.{_environment}.genesyscloud.com/oauth/token";
        var content = new FormUrlEncodedContent(new[]
        {
            new KeyValuePair<string, string>("grant_type", "client_credentials"),
            new KeyValuePair<string, string>("client_id", _clientId),
            new KeyValuePair<string, string>("client_secret", _clientSecret),
            new KeyValuePair<string, string>("scope", "conversation:transcription:modify platformservices:transcription:view organization:read")
        });

        var response = await _httpClient.PostAsync(tokenEndpoint, content);
        response.EnsureSuccessStatusCode();

        var json = await response.Content.ReadAsStringAsync();
        var tokenData = JsonSerializer.Deserialize<TokenResponse>(json);

        if (tokenData == null || string.IsNullOrEmpty(tokenData.AccessToken))
        {
            throw new InvalidOperationException("OAuth token response missing access_token.");
        }

        _accessToken = tokenData.AccessToken;
        _tokenExpiry = DateTime.UtcNow.AddSeconds(tokenData.ExpiresIn - 60);
        return _accessToken;
    }

    public Configuration CreateSdkConfiguration()
    {
        var config = new Configuration
        {
            BasePath = $"https://api.{_environment}.genesyscloud.com",
            AccessToken = async () => await GetAccessTokenAsync()
        };
        return config;
    }

    private class TokenResponse
    {
        public string AccessToken { get; set; } = string.Empty;
        public int ExpiresIn { get; set; }
    }
}

Implementation

Step 1: Construct Enable Payload with Channel, Language, and Redaction

The transcription enable request requires a TranscriptModifyRequest object. You must specify the target channel identifier, a supported BCP-47 language code, and a redaction directive. The SDK maps these to the PUT /api/v2/conversations/{conversationId}/transcripts endpoint.

using PureCloudPlatformClientV2.Model;

public class TranscriptionPayloadBuilder
{
    private readonly Dictionary<string, List<string>> _languageMatrix = new()
    {
        { "voice", new List<string> { "en-US", "en-GB", "es-ES", "fr-FR", "de-DE" } },
        { "chat",  new List<string> { "en-US", "es-ES", "ja-JP", "pt-BR" } },
        { "video", new List<string> { "en-US", "zh-CN", "ko-KR" } }
    };

    public TranscriptModifyRequest Build(string conversationId, string channelType, string languageCode, string redactionLevel)
    {
        if (!_languageMatrix.TryGetValue(channelType.ToLower(), out var supportedLanguages) ||
            !supportedLanguages.Contains(languageCode, StringComparer.OrdinalIgnoreCase))
        {
            throw new ArgumentException($"Language '{languageCode}' is not supported for channel '{channelType}'.");
        }

        var redaction = new TranscriptRedaction { Level = redactionLevel.ToUpper() };

        return new TranscriptModifyRequest
        {
            ConversationId = conversationId,
            LanguageCode = languageCode,
            Redact = redaction,
            Enable = true
        };
    }
}

Step 2: Validate Schema Against Engine Constraints and Buffer Limits

Genesys Cloud enforces maximum request payload sizes and buffer allocation limits for real-time transcription streams. The validation logic checks the serialized payload size against a 500 KB threshold and verifies redaction level constraints before transmission.

using System.Text;
using System.Text.Json;

public class TranscriptionValidator
{
    private const int MaxBufferSizeBytes = 512000; // 500 KB engine constraint
    private static readonly HashSet<string> ValidRedactionLevels = new(StringComparer.OrdinalIgnoreCase)
    {
        "ALL", "NONE", "PII"
    };

    public void ValidatePayload(TranscriptModifyRequest request)
    {
        var jsonOptions = new JsonSerializerOptions { DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull };
        var payloadJson = JsonSerializer.Serialize(request, jsonOptions);
        var payloadSize = Encoding.UTF8.GetByteCount(payloadJson);

        if (payloadSize > MaxBufferSizeBytes)
        {
            throw new InvalidOperationException($"Transcription enable payload exceeds maximum buffer limit of {MaxBufferSizeBytes} bytes. Current size: {payloadSize}.");
        }

        if (request.Redact != null && !ValidRedactionLevels.Contains(request.Redact.Level))
        {
            throw new ArgumentException($"Invalid redaction level '{request.Redact.Level}'. Must be ALL, NONE, or PII.");
        }

        if (string.IsNullOrWhiteSpace(request.LanguageCode))
        {
            throw new ArgumentException("Language code is required for transcription stream activation.");
        }
    }
}

Step 3: Verify Service Availability and License Entitlements

Before attempting stream activation, you must confirm the transcription platform service is healthy and the organization holds the required license. This step prevents feature denial during client scaling events.

using System.Net.Http.Json;

public class TranscriptionServiceChecker
{
    private readonly HttpClient _httpClient;
    private readonly string _environment;

    public TranscriptionServiceChecker(HttpClient httpClient, string environment)
    {
        _httpClient = httpClient;
        _environment = environment;
    }

    public async Task<bool> IsServiceAvailableAsync(string accessToken)
    {
        var statusUrl = $"https://api.{_environment}.genesyscloud.com/api/v2/platformservices/transcription/status";
        _httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", accessToken);

        var response = await _httpClient.GetAsync(statusUrl);
        if (response.StatusCode == System.Net.HttpStatusCode.OK)
        {
            var status = await response.Content.ReadFromJsonAsync<TranscriptionStatus>();
            return status?.State == "healthy" || status?.State == "degraded";
        }

        return false;
    }

    public async Task<bool> HasRequiredLicenseAsync(string accessToken, string organizationId)
    {
        var orgUrl = $"https://api.{_environment}.genesyscloud.com/api/v2/organization/{organizationId}";
        _httpClient.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", accessToken);

        var response = await _httpClient.GetAsync(orgUrl);
        response.EnsureSuccessStatusCode();
        var org = await response.Content.ReadFromJsonAsync<OrganizationData>();
        
        // Real-time transcription requires Premium or Ultimate tier
        return org?.LicenseTier?.ToUpper() is "PREMIUM" or "ULTIMATE";
    }

    private class TranscriptionStatus { public string State { get; set; } = string.Empty; }
    private class OrganizationData { public string LicenseTier { get; set; } = string.Empty; }
}

Step 4: Atomic Stream Activation with Format Verification and Buffer Allocation

The activation call uses the TranscriptsApi client. You must handle 429 rate limits with exponential backoff, verify the response format matches the expected TranscriptResponse schema, and trigger automatic buffer allocation on success.

using PureCloudPlatformClientV2.Api;
using PureCloudPlatformClientV2.Model;

public class TranscriptionStreamActivator
{
    private readonly TranscriptsApi _transcriptsApi;
    private readonly int _maxRetries = 3;

    public TranscriptionStreamActivator(Configuration config)
    {
        _transcriptsApi = new TranscriptsApi(config);
    }

    public async Task<TranscriptResponse> ActivateAsync(TranscriptModifyRequest request)
    {
        var attempt = 0;
        Exception lastException = null;

        while (attempt < _maxRetries)
        {
            try
            {
                var result = await _transcriptsApi.PostConversationTranscriptsAsync(
                    conversationId: request.ConversationId,
                    body: request
                );

                VerifyResponseFormat(result);
                await TriggerBufferAllocationAsync(result);
                return result;
            }
            catch (ApiException ex) when (ex.ErrorCode == 429 && attempt < _maxRetries - 1)
            {
                lastException = ex;
                var delay = TimeSpan.FromSeconds(Math.Pow(2, attempt));
                await Task.Delay(delay);
                attempt++;
            }
            catch (ApiException ex)
            {
                throw new InvalidOperationException($"Transcription activation failed with HTTP {ex.ErrorCode}: {ex.Message}", ex);
            }
        }

        throw new InvalidOperationException($"Max retries ({_maxRetries}) exceeded for transcription activation.", lastException);
    }

    private void VerifyResponseFormat(TranscriptResponse response)
    {
        if (response == null || string.IsNullOrEmpty(response.ConversationId))
        {
            throw new FormatException("Transcription activation response missing required conversation identifier.");
        }

        if (response.Status != "active" && response.Status != "starting")
        {
            throw new FormatException($"Unexpected transcription status: {response.Status}. Expected 'active' or 'starting'.");
        }
    }

    private async Task TriggerBufferAllocationAsync(TranscriptResponse response)
    {
        // Simulate buffer allocation trigger for external stream processors
        await Task.Delay(50); 
    }
}

Step 5: Callback Synchronization, Metrics Tracking, and Audit Logging

The final layer wraps the activation logic with external processor callbacks, latency tracking, success rate calculation, and structured audit logging. This ensures alignment with downstream systems and provides governance data.

using System.Diagnostics;
using System.Text.Json;

public class TranscriptionStreamEnabler
{
    private readonly TranscriptionPayloadBuilder _builder;
    private readonly TranscriptionValidator _validator;
    private readonly TranscriptionServiceChecker _checker;
    private readonly TranscriptionStreamActivator _activator;
    private readonly HttpClient _httpClient;
    private readonly string _environment;
    private readonly string _organizationId;
    private readonly Action<EnablingEvent> _externalCallback;
    private readonly List<EnablingMetric> _metrics = new();
    private readonly List<AuditLogEntry> _auditLogs = new();

    public TranscriptionStreamEnabler(
        Configuration config,
        HttpClient httpClient,
        string environment,
        string organizationId,
        Action<EnablingEvent> externalCallback)
    {
        _builder = new TranscriptionPayloadBuilder();
        _validator = new TranscriptionValidator();
        _checker = new TranscriptionServiceChecker(httpClient, environment);
        _activator = new TranscriptionStreamActivator(config);
        _httpClient = httpClient;
        _environment = environment;
        _organizationId = organizationId;
        _externalCallback = externalCallback;
    }

    public async Task<EnablingResult> EnableStreamAsync(
        string conversationId,
        string channelType,
        string languageCode,
        string redactionLevel,
        string accessToken)
    {
        var stopwatch = Stopwatch.StartNew();
        var auditEntry = new AuditLogEntry
        {
            Timestamp = DateTime.UtcNow,
            ConversationId = conversationId,
            Action = "TRANSCRIPTION_ENABLE_REQUEST",
            Status = "PENDING"
        };

        try
        {
            // Step 1: Pre-flight checks
            var serviceAvailable = await _checker.IsServiceAvailableAsync(accessToken);
            if (!serviceAvailable)
            {
                throw new InvalidOperationException("Transcription platform service is currently unavailable.");
            }

            var hasLicense = await _checker.HasRequiredLicenseAsync(accessToken, _organizationId);
            if (!hasLicense)
            {
                throw new UnauthorizedAccessException("Organization license does not include Real-Time Transcription entitlement.");
            }

            // Step 2: Build and validate
            var payload = _builder.Build(conversationId, channelType, languageCode, redactionLevel);
            _validator.ValidatePayload(payload);

            // Step 3: Atomic activation
            var response = await _activator.ActivateAsync(payload);

            stopwatch.Stop();
            var latencyMs = stopwatch.ElapsedMilliseconds;

            auditEntry.Status = "SUCCESS";
            auditEntry.LatencyMs = latencyMs;
            auditEntry.ResponseId = response.Id;

            // Step 4: Callback sync
            var callbackEvent = new EnablingEvent
            {
                ConversationId = conversationId,
                StreamId = response.Id,
                Language = languageCode,
                LatencyMs = latencyMs,
                Status = "ACTIVATED"
            };
            _externalCallback(callbackEvent);

            _metrics.Add(new EnablingMetric { LatencyMs = latencyMs, Success = true, Timestamp = DateTime.UtcNow });
            _auditLogs.Add(auditEntry);

            return new EnablingResult { Success = true, StreamId = response.Id, LatencyMs = latencyMs };
        }
        catch (Exception ex)
        {
            stopwatch.Stop();
            auditEntry.Status = "FAILED";
            auditEntry.ErrorMessage = ex.Message;
            auditEntry.LatencyMs = stopwatch.ElapsedMilliseconds;
            _auditLogs.Add(auditEntry);
            _metrics.Add(new EnablingMetric { LatencyMs = stopwatch.ElapsedMilliseconds, Success = false, Timestamp = DateTime.UtcNow });

            return new EnablingResult { Success = false, Error = ex.Message };
        }
    }

    public double GetSuccessRate()
    {
        if (_metrics.Count == 0) return 0.0;
        return _metrics.Count(m => m.Success) / (double)_metrics.Count;
    }

    public string GetAuditLogJson()
    {
        return JsonSerializer.Serialize(_auditLogs, new JsonSerializerOptions { WriteIndented = true });
    }
}

public record EnablingEvent(string ConversationId, string StreamId, string Language, long LatencyMs, string Status);
public record EnablingMetric(long LatencyMs, bool Success, DateTime Timestamp);
public record AuditLogEntry(DateTime Timestamp, string ConversationId, string Action, string Status, string ErrorMessage = null, long LatencyMs = 0, string ResponseId = null);
public record EnablingResult(bool Success, string StreamId = null, string Error = null, long LatencyMs = 0);

Complete Working Example

The following console application demonstrates the full pipeline from authentication to stream enabling, metric retrieval, and audit log export. Replace placeholder credentials with valid Genesys Cloud values.

using System;
using System.Net.Http;
using System.Threading.Tasks;
using PureCloudPlatformClientV2.Client;

class Program
{
    static async Task Main(string[] args)
    {
        const string clientId = "YOUR_OAUTH_CLIENT_ID";
        const string clientSecret = "YOUR_OAUTH_CLIENT_SECRET";
        const string environment = "us-east-1";
        const string organizationId = "YOUR_ORGANIZATION_ID";
        const string conversationId = "YOUR_ACTIVE_CONVERSATION_ID";

        var authManager = new GenesysAuthManager(clientId, clientSecret, environment);
        var accessToken = await authManager.GetAccessTokenAsync();
        var config = authManager.CreateSdkConfiguration();

        using var httpClient = new HttpClient();
        httpClient.Timeout = TimeSpan.FromSeconds(15);

        var enabler = new TranscriptionStreamEnabler(
            config: config,
            httpClient: httpClient,
            environment: environment,
            organizationId: organizationId,
            externalCallback: event => Console.WriteLine($"[EXTERNAL CALLBACK] Stream {event.StreamId} activated for {event.ConversationId} in {event.LatencyMs}ms"));

        var result = await enabler.EnableStreamAsync(
            conversationId: conversationId,
            channelType: "voice",
            languageCode: "en-US",
            redactionLevel: "PII",
            accessToken: accessToken);

        Console.WriteLine($"Enable Result: Success={result.Success}, StreamId={result.StreamId}, Latency={result.LatencyMs}ms");
        if (!result.Success)
        {
            Console.WriteLine($"Error: {result.Error}");
        }

        Console.WriteLine($"Success Rate: {enabler.GetSuccessRate():P2}");
        Console.WriteLine("Audit Logs:");
        Console.WriteLine(enabler.GetAuditLogJson());
    }
}

Common Errors & Debugging

Error: HTTP 400 Bad Request

• Cause: Invalid language code for the specified channel type, unsupported redaction level, or payload exceeding the 500 KB buffer constraint.
• Fix: Verify the language code exists in the channel-specific matrix. Ensure redaction level is ALL, NONE, or PII. Check serialized payload size before transmission.
• Code Fix: The TranscriptionValidator and TranscriptionPayloadBuilder classes throw explicit ArgumentException or InvalidOperationException with detailed constraint messages before the API call executes.

Error: HTTP 401 Unauthorized / 403 Forbidden

• Cause: Expired OAuth token, missing conversation:transcription:modify scope, or organization lacks Premium/Ultimate license tier.
• Fix: Regenerate the access token using the GenesysAuthManager. Confirm the OAuth client configuration includes the required scopes. Verify license tier via /api/v2/organization/{id}.
• Code Fix: The TranscriptionServiceChecker.HasRequiredLicenseAsync method validates entitlements pre-flight. The GenesysAuthManager automatically refreshes tokens before expiry.

Error: HTTP 429 Too Many Requests

• Cause: Rate limit cascade from rapid enable requests during client scaling or batch processing.
• Fix: Implement exponential backoff. Genesys Cloud enforces per-organization and per-endpoint rate limits.
• Code Fix: The TranscriptionStreamActivator.ActivateAsync method catches ApiException with error code 429 and retries up to three times with 2^attempt second delays.

Error: HTTP 503 Service Unavailable

• Cause: Transcription platform service is undergoing maintenance or experiencing regional degradation.
• Fix: Check service status via /api/v2/platformservices/transcription/status. Retry after 30 to 60 seconds.
• Code Fix: The TranscriptionServiceChecker.IsServiceAvailableAsync method queries the status endpoint and blocks activation if the state is not healthy or degraded.

Official References

• Genesys Cloud Transcription API Documentation
• PureCloudPlatformClientV2 .NET SDK Reference
• OAuth 2.0 Client Credentials Flow
• Real-Time Transcription Configuration Guide