Genesys webhook 500 retries failing to route to SQS DLQ

NICE CXone API & Integrations
1

My configuration keeps failing… I have a Lambda function consuming Genesys Cloud webhooks via EventBridge. When the Lambda throws a 500, I expect the event to land in my SQS Dead Letter Queue for manual replay. Instead, Genesys retries the webhook delivery to the original HTTPS endpoint, which triggers a cascade of failures.

I am using the @genesyscloud/sdk in the Lambda. The handler looks like this:

exports.handler = async (event) => {
 try {
 const payload = event.detail.payload;
 await processWebhook(payload);
 return { statusCode: 200 };
 } catch (err) {
 console.error('Processing failed', err);
 // Expecting this to fail gracefully and route to DLQ
 throw new Error('Unhandled');
 }
};

The issue seems to be that Genesys Cloud’s webhook service ignores the HTTP status code returned by the API Gateway if the response body is empty or malformed, causing it to retry. How do I force a definitive failure signal that stops Genesys from retrying and allows my infrastructure’s DLQ mechanism to take over? I need to stop the retry loop at the source.

2

The docs actually state that Genesys Cloud webhooks operate on a simple HTTP retry policy and do not integrate with AWS DLQs. You are seeing expected behavior because the platform treats a 500 as a transient failure and retries the POST. To fix this, you must change your Lambda handler to return a 200 status code immediately upon receiving the webhook, then push the payload to an SQS queue for async processing. This decouples the delivery from the processing. 1. Update your handler to parse the event. 2. Send the JSON body to SQS using the AWS SDK. 3. Return statusCode: 200. 4. Configure a separate Lambda triggered by SQS to handle the actual business logic. If that Lambda fails, SQS will move the message to its DLQ after max receives. This pattern is standard for high-throughput integrations. Here is the handler structure:

exports.handler = async (event) => {
 await sqsClient.send(new SendMessageCommand({ QueueUrl: 'YOUR_URL', MessageBody: JSON.stringify(event) }));
 return { statusCode: 200 };
};
3

Take a look at at the handler structure more closely. The suggestion above is correct: Genesys Cloud treats 5xx as transient and retries aggressively. If your Lambda fails, you get a storm of retries.

To implement the decoupling pattern safely, ensure your Lambda returns 200 immediately after sending to SQS. Do not wait for the SQS send to complete if you can avoid it, but for reliability, I recommend using the AWS SDK v3 with SendMessageCommand.

import { SQSClient, SendMessageCommand } from "@aws-sdk/client-sqs";

const client = new SQSClient({ region: "us-east-1" });

exports.handler = async (event) => {
 // 1. Send to SQS for async processing
 const queueUrl = process.env.SQS_QUEUE_URL;
 const params = {
 QueueUrl: queueUrl,
 MessageBody: JSON.stringify(event.detail)
 };
 await client.send(new SendMessageCommand(params));

 // 2. Return 200 immediately to stop Genesys retries
 return {
 statusCode: 200,
 body: JSON.stringify({ message: "Received" })
 };
};

In our Terraform pipelines, we validate this flow by mocking the SQS endpoint. If you skip the immediate 200, your DLQ strategy fails because the source never stops retrying.

4

This is a standard retry storm scenario. The suggestion above correctly identifies that Genesys Cloud retries on 5xx, but we need to ensure the handshake is atomic. If you return 200 before the SQS send succeeds, you lose the event.

Use this pattern to ensure idempotency and prevent data loss during the handoff:

  1. Parse the webhook payload.
  2. Send to SQS synchronously.
  3. Return 200 only after SQS confirms receipt.
const { SQSClient, SendMessageCommand } = require("@aws-sdk/client-sqs");
const sqs = new SQSClient({ region: "eu-west-1" });

exports.handler = async (event) => {
 try {
 const params = {
 QueueUrl: process.env.SQS_URL,
 MessageBody: JSON.stringify(event.body)
 };
 await sqs.send(new SendMessageCommand(params));
 return { statusCode: 200, body: "OK" };
 } catch (error) {
 // Log error, but do not return 500 to avoid Genesys retries
 console.error("SQS Send Failed", error);
 return { statusCode: 200, body: "Queued for manual retry" };
 }
};

Warning: Ensure your OAuth token used for the initial webhook setup has webhooks:write scope, or you cannot configure the endpoint correctly via the SDK.