Data Action POST 400 on custom payload validation

NICE CXone API & Integrations
1

Can anyone clarify the strict schema requirements for custom data actions in Genesys Cloud?

Background
Deploying via Terraform provider v1.1.5. GC CLI v2.4.0. Targeting APAC edge.

Issue
Architect flow invokes data action. Returns HTTP 400 Bad Request. Response body: "message": "Invalid payload structure". Payload matches doc examples exactly.

Troubleshooting

  • Verified JSON syntax with jq.
  • Checked API keys have analytics:reporting:read scope.
  • Tested with curl directly against API endpoint. Same 400 error.

Snippet below. Any ideas?