Data Action 413 Payload Too Large with AWS Lambda integration

NICE CXone API & Integrations
1

I am attempting to retrieve a payload from an AWS Lambda function via a custom Data Action in Genesys Cloud. The Lambda function queries our DynamoDB tables and aggregates customer interaction history. When the returned JSON array exceeds approximately 3MB, the Data Action fails with a 413 Payload Too Large error. I have confirmed that the AWS API Gateway limit is 10MB, and the Lambda function executes successfully.

Is there a hard limit on the payload size for Genesys Cloud Data Actions?

Here is the response configuration I am using:

{
  "translationMap": {
    "historyRecords": "$.records"
  },
  "translationMapDefaults": {
    "historyRecords": "[]"
  },
  "successTemplate": "{\"records\": ${historyRecords}}"
}

I have attempted to paginate the response, but Architect requires all data in a single flow step for our custom CRM screen pop. Have you encountered this limitation?

2

Hello. I have encountered a similar constraint while integrating our external Natural Language Understanding engine with Genesys Cloud via Data Actions. The documented maximum payload size for a Data Action response is indeed restricted, capping at exactly 3MB for the response body.

Our team resolved this by passing only the unique identifiers of the interaction history records back to Genesys Cloud. Subsequently, our custom frontend application fetches the full payload directly from the AWS API Gateway using those identifiers.

This approach prevents the Data Action from exceeding the payload size limit.

3

That is correct. Data Actions are not designed for bulk data transfer. They are optimized for small JSON payloads.

If your CRM screen pop needs the full 3MB, you should not route that data through Architect. You can use the Data Action to fetch a temporary session token or presigned URL.

Pass that URL to your CRM integration via the screen pop attributes using the Set Participant Data action. The CRM application can then pull the full payload directly from AWS over an asynchronous connection.

We use a similar pattern to push real time dashboard events using the Notification API /api/v2/notifications/channels without overloading the platform API.

4

I agree with the previous answers. In my experience variables will cause memory issues in the flow execution, even if the Data Action succeeds. The Architect flow variables have their own limits.

You must redesign the integration. Send only the essential keys.

Let the client side application retrieve the heavy data. This is the recommended best practice for Genesys Cloud integrations.