Migrating Genesys Cloud SCIM Group Memberships via C# Bulk API

What You Will Build

• A C# service that migrates user group memberships using the Genesys Cloud SCIM Bulk API with pre-flight validation, batch limits, audit logging, and external webhook synchronization.
• The implementation uses the GenesysCloudPlatformClientV2 SDK and the /api/v2/scim/v2/Bulk endpoint.
• The tutorial covers C# 8+ with .NET 6+ using async/await, HttpClient, and System.Text.Json.

Prerequisites

• OAuth client credentials (confidential client) registered in Genesys Cloud
• Required scopes: scim:groups:write, scim:users:read, scim:users:write, scim:groups:read
• SDK version: GenesysCloudPlatformClientV2 >= 129.0.0
• Runtime: .NET 6.0 or later
• Dependencies: GenesysCloudPlatformClientV2, System.Text.Json, Polly (for retry logic)

Authentication Setup

The Genesys Cloud platform requires a bearer token for all SCIM operations. The following code demonstrates client credentials flow with automatic token refresh handling via the SDK.

using GenesysCloudPlatformClientV2;
using GenesysCloudPlatformClientV2.Auth;
using System;
using System.Threading.Tasks;

public static class AuthSetup
{
    public static async Task<ApiClient> InitializeApiClient(string environment, string clientId, string clientSecret)
    {
        var configuration = Configuration.Default;
        configuration.OAuth2ClientId = clientId;
        configuration.OAuth2ClientSecret = clientSecret;
        configuration.Region = environment; // e.g., "us-east-1" or "eu-west-1"

        var apiClient = new ApiClient(configuration);
        await apiClient.OAuthClientCredentialsFlow(clientId, clientSecret);
        
        // The SDK handles token refresh automatically when making requests.
        return apiClient;
    }
}

Implementation

Step 1: Pre-flight Validation Pipelines

Before constructing migration payloads, you must verify source group existence and target group capacity. Genesys Cloud enforces directory sync constraints that reject bulk operations if referenced entities do not exist or exceed platform limits. The following pipeline queries the SCIM Groups endpoint and validates constraints.

using GenesysCloudPlatformClientV2.Api;
using GenesysCloudPlatformClientV2.Model;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;

public class PreFlightValidator
{
    private readonly ScimApi _scimApi;
    private readonly int _maxGroupMembers;

    public PreFlightValidator(ScimApi scimApi, int maxGroupMembers = 50000)
    {
        _scimApi = scimApi;
        _maxGroupMembers = maxGroupMembers;
    }

    public async Task<ValidationResult> ValidateGroupsAsync(IEnumerable<string> sourceGroupIds, IEnumerable<string> targetGroupIds)
    {
        var errors = new List<string>();
        var existingSources = new HashSet<string>();
        var existingTargets = new HashSet<string>();

        foreach (var id in sourceGroupIds)
        {
            try
            {
                var group = await _scimApi.PostScimV2Groups(id);
                existingSources.Add(id);
            }
            catch (ApiException ex) when (ex.ErrorCode == 404)
            {
                errors.Add($"Source group {id} does not exist.");
            }
            catch (ApiException ex) when (ex.ErrorCode == 401 || ex.ErrorCode == 403)
            {
                throw new UnauthorizedAccessException("Authentication or authorization failed during pre-flight validation.", ex);
            }
        }

        foreach (var id in targetGroupIds)
        {
            try
            {
                var group = await _scimApi.PostScimV2Groups(id);
                if (group.Members != null && group.Members.Count >= _maxGroupMembers)
                {
                    errors.Add($"Target group {id} exceeds maximum capacity of {_maxGroupMembers}.");
                }
                else
                {
                    existingTargets.Add(id);
                }
            }
            catch (ApiException ex) when (ex.ErrorCode == 404)
            {
                errors.Add($"Target group {id} does not exist.");
            }
        }

        return new ValidationResult
        {
            IsValid = errors.Count == 0,
            Errors = errors,
            ValidSourceIds = existingSources,
            ValidTargetIds = existingTargets
        };
    }
}

public record ValidationResult(bool IsValid, List<string> Errors, HashSet<string> ValidSourceIds, HashSet<string> ValidTargetIds);

Step 2: Construct Migration Payloads with Target Matrix and Transfer Directive

The SCIM Bulk API accepts an array of operations. Each operation requires a method, path, and data payload. The following mapper constructs SCIM-compliant PATCH operations using membership references, a target matrix, and a transfer directive. The payload bypasses intermediate foreign key constraint checks by submitting all membership updates in a single atomic request.

using GenesysCloudPlatformClientV2.Model;
using System.Collections.Generic;
using System.Text.Json;
using System.Text.Json.Serialization;

public class MigrationPayloadBuilder
{
    private const int MaxBatchSize = 100; // Genesys Cloud SCIM Bulk limit

    public record TransferDirective(string SourceGroupId, string TargetGroupId, List<string> UserIds);
    public record TargetMatrix(Dictionary<string, TransferDirective> Mappings);

    public List<BulkRequest> BuildBulkRequests(TargetMatrix matrix, int batchSize = MaxBatchSize)
    {
        var requests = new List<BulkRequest>();
        var operations = new List<BulkOperation>();

        foreach (var mapping in matrix.Mappings.Values)
        {
            foreach (var userId in mapping.UserIds)
            {
                var scimPatchPayload = new
                {
                    schemas = new[] { "urn:ietf:params:scim:api:messages:2.0:PatchOp" },
                    Operations = new[]
                    {
                        new
                        {
                            op = "add",
                            path = "members",
                            value = new[]
                            {
                                new
                                {
                                    value = userId,
                                    ref = $"https://{GenesysCloudPlatformClientV2.Configuration.Default.Region}.mygenesys.com/api/v2/scim/v2/Users/{userId}",
                                    display = userId
                                }
                            }
                        }
                    }
                };

                var operation = new BulkOperation
                {
                    Method = "PATCH",
                    Path = $"/Groups/{mapping.TargetGroupId}",
                    Data = JsonSerializer.SerializeToNode(scimPatchPayload)
                };

                operations.Add(operation);

                if (operations.Count >= batchSize)
                {
                    requests.Add(new BulkRequest { Operations = operations });
                    operations = new List<BulkOperation>();
                }
            }
        }

        if (operations.Count > 0)
        {
            requests.Add(new BulkRequest { Operations = operations });
        }

        return requests;
    }
}

Step 3: Execute Atomic POST Operations with Consistency Checkpoints

The bulk execution loop sends each batch to /api/v2/scim/v2/Bulk. The SDK throws ApiException on failure. The following implementation includes retry logic for 429 responses, consistency checkpoint triggers, latency tracking, and success rate calculation.

using GenesysCloudPlatformClientV2.Api;
using GenesysCloudPlatformClientV2.Model;
using Polly;
using System;
using System.Diagnostics;
using System.Net.Http;
using System.Threading.Tasks;

public class BulkMigrator
{
    private readonly ScimApi _scimApi;
    private readonly Func<string, Task> _checkpointTrigger;
    private readonly HttpClient _webhookClient;
    private readonly string _iamWebhookUrl;

    public BulkMigrator(ScimApi scimApi, Func<string, Task> checkpointTrigger, HttpClient webhookClient, string iamWebhookUrl)
    {
        _scimApi = scimApi;
        _checkpointTrigger = checkpointTrigger;
        _webhookClient = webhookClient;
        _iamWebhookUrl = iamWebhookUrl;
    }

    public async Task<MigrationMetrics> ExecuteAsync(IEnumerable<BulkRequest> batches)
    {
        var metrics = new MigrationMetrics();
        var stopwatch = new Stopwatch();
        var retryPolicy = Policy.HandleResult<ApiResponse<BulkResponse>>(r => r.StatusCode == 429)
            .WaitAndRetryAsync(3, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)));

        foreach (var batch in batches)
        {
            stopwatch.Restart();
            
            var response = await retryPolicy.ExecuteAsync(async () =>
            {
                var apiResponse = await _scimApi.PostScimV2BulkWithHttpInfo(batch);
                return apiResponse.Data;
            });

            var latency = stopwatch.ElapsedMilliseconds;
            metrics.TotalLatencyMs += latency;
            metrics.BatchesProcessed++;

            if (response.SuccessResponses != null)
                metrics.SuccessfulTransfers += response.SuccessResponses.Count;
            if (response.ErrorResponses != null)
                metrics.FailedTransfers += response.ErrorResponses.Count;

            await _checkpointTrigger.Invoke($"Checkpoint: Batch completed. Success: {metrics.SuccessfulTransfers}, Failed: {metrics.FailedTransfers}");
        }

        metrics.SuccessRate = metrics.BatchesProcessed > 0 
            ? (double)metrics.SuccessfulTransfers / (metrics.SuccessfulTransfers + metrics.FailedTransfers) 
            : 0.0;

        await SyncExternalIAMAsync(metrics);
        return metrics;
    }

    private async Task SyncExternalIAMAsync(MigrationMetrics metrics)
    {
        var payload = new { migrationId = Guid.NewGuid().ToString(), successRate = metrics.SuccessRate, timestamp = DateTime.UtcNow };
        var content = new StringContent(JsonSerializer.Serialize(payload), System.Text.Encoding.UTF8, "application/json");
        await _webhookClient.PostAsync(_iamWebhookUrl, content);
    }
}

public record MigrationMetrics(
    int BatchesProcessed = 0,
    int SuccessfulTransfers = 0,
    int FailedTransfers = 0,
    long TotalLatencyMs = 0,
    double SuccessRate = 0.0);

Complete Working Example

The following script combines validation, payload construction, execution, and audit logging into a single runnable console application. Replace placeholder credentials and identifiers before execution.

using GenesysCloudPlatformClientV2;
using GenesysCloudPlatformClientV2.Api;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using System.Threading.Tasks;

public class GroupMembershipMigrator
{
    private readonly ScimApi _scimApi;
    private readonly PreFlightValidator _validator;
    private readonly MigrationPayloadBuilder _builder;
    private readonly BulkMigrator _migrator;
    private readonly string _auditLogPath;

    public GroupMembershipMigrator(ApiClient apiClient, string iamWebhookUrl, string auditLogPath)
    {
        _scimApi = new ScimApi(apiClient);
        _validator = new PreFlightValidator(_scimApi);
        _builder = new MigrationPayloadBuilder();
        var checkpoint = async (msg) =>
        {
            Console.WriteLine(msg);
            await LogAuditAsync(auditLogPath, $"CHECKPOINT: {msg}");
        };
        _migrator = new BulkMigrator(_scimApi, checkpoint, new HttpClient(), iamWebhookUrl);
        _auditLogPath = auditLogPath;
    }

    public async Task RunMigrationAsync(MigrationPayloadBuilder.TargetMatrix matrix)
    {
        var sourceIds = new HashSet<string>();
        var targetIds = new HashSet<string>();
        foreach (var m in matrix.Mappings.Values)
        {
            sourceIds.Add(m.SourceGroupId);
            targetIds.Add(m.TargetGroupId);
        }

        await LogAuditAsync(_auditLogPath, "START: Pre-flight validation initiated.");
        var validation = await _validator.ValidateGroupsAsync(sourceIds, targetIds);
        
        if (!validation.IsValid)
        {
            var errorLog = string.Join("; ", validation.Errors);
            await LogAuditAsync(_auditLogPath, $"FAILURE: Validation failed. {errorLog}");
            throw new InvalidOperationException($"Migration aborted: {errorLog}");
        }

        await LogAuditAsync(_auditLogPath, "SUCCESS: Pre-flight validation passed.");
        var batches = _builder.BuildBulkRequests(matrix);
        
        await LogAuditAsync(_auditLogPath, $"START: Executing {batches.Count} bulk batches.");
        var metrics = await _migrator.ExecuteAsync(batches);
        
        await LogAuditAsync(_auditLogPath, $"COMPLETE: Batches={metrics.BatchesProcessed}, Success={metrics.SuccessfulTransfers}, Failed={metrics.FailedTransfers}, Latency={metrics.TotalLatencyMs}ms, Rate={metrics.SuccessRate:P2}");
    }

    private async Task LogAuditAsync(string path, string message)
    {
        var logEntry = $"{DateTime.UtcNow:yyyy-MM-ddTHH:mm:ss.fffZ} | {message}{Environment.NewLine}";
        await File.AppendAllTextAsync(path, logEntry);
    }
}

public static class Program
{
    public static async Task Main(string[] args)
    {
        var environment = "us-east-1";
        var clientId = "YOUR_CLIENT_ID";
        var clientSecret = "YOUR_CLIENT_SECRET";
        var iamWebhookUrl = "https://your-iam-sync-endpoint.com/webhook";
        var auditLogPath = "migration_audit.log";

        var apiClient = await AuthSetup.InitializeApiClient(environment, clientId, clientSecret);
        
        var matrix = new MigrationPayloadBuilder.TargetMatrix(new Dictionary<string, MigrationPayloadBuilder.TransferDirective>
        {
            {
                "mapping_1",
                new MigrationPayloadBuilder.TransferDirective(
                    sourceGroupId: "source-group-id-123",
                    targetGroupId: "target-group-id-456",
                    userIds: new List<string> { "user-id-a", "user-id-b", "user-id-c" })
            }
        });

        var migrator = new GroupMembershipMigrator(apiClient, iamWebhookUrl, auditLogPath);
        await migrator.RunMigrationAsync(matrix);
    }
}

Common Errors & Debugging

Error: 400 Bad Request - SCIM Payload Format Mismatch

• What causes it: The data field in the bulk operation must be a JSON node representing a valid SCIM PatchOp document. Passing raw strings or missing the schemas array triggers schema validation failures.
• How to fix it: Ensure the BulkOperation.Data property is populated with JsonSerializer.SerializeToNode() output containing urn:ietf:params:scim:api:messages:2.0:PatchOp.
• Code showing the fix:

var scimPatchPayload = new
{
    schemas = new[] { "urn:ietf:params:scim:api:messages:2.0:PatchOp" },
    Operations = new[]
    {
        new { op = "add", path = "members", value = new[] { new { value = userId, ref = $"https://{Configuration.Default.Region}.mygenesys.com/api/v2/scim/v2/Users/{userId}" } } }
    }
};
operation.Data = JsonSerializer.SerializeToNode(scimPatchPayload);

Error: 403 Forbidden - Insufficient OAuth Scopes

• What causes it: The client credentials token lacks scim:groups:write or scim:users:write. Genesys Cloud rejects bulk membership mutations without explicit write permissions.
• How to fix it: Update the OAuth application configuration in the Genesys Cloud admin console to include scim:groups:write and scim:users:write. Regenerate the token.
• Code showing the fix: No code change required. Verify configuration.OAuth2ClientId and configuration.OAuth2ClientSecret reference a client with the correct scope assignments.

Error: 429 Too Many Requests - Rate Limit Cascade

• What causes it: Exceeding the SCIM Bulk endpoint quota or triggering platform-wide throttling during high-volume migrations.
• How to fix it: Implement exponential backoff. The Polly retry policy in Step 3 handles this automatically. If failures persist, reduce batch size below 100 operations or introduce Task.Delay between batches.
• Code showing the fix:

var retryPolicy = Policy.HandleResult<ApiResponse<BulkResponse>>(r => r.StatusCode == 429)
    .WaitAndRetryAsync(3, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)));

Error: 500 Internal Server Error - Foreign Key Constraint Bypass Failure

• What causes it: Attempting to add a user to a group where the user ID does not exist in the platform directory. SCIM does not support true foreign key bypass; the platform validates entity existence atomically.
• How to fix it: Run the pre-flight validation pipeline before execution. Filter out invalid user IDs from the transfer directive.
• Code showing the fix: The PreFlightValidator.ValidateGroupsAsync method queries /api/v2/scim/v2/Groups/{id} and rejects non-existent references before payload construction.

Official References

• Genesys Cloud SCIM Bulk API Documentation
• Genesys Cloud SCIM Groups API Documentation
• Genesys Cloud C# SDK Reference
• OAuth 2.0 Client Credentials Flow