Terraform CX-as-Code: Sending canned responses via Genesys Conversations API

We are attempting to automate the delivery of standard compliance messages during active chat interactions using the Genesys Cloud Conversations API. The specific endpoint in question is POST /api/v2/conversations/chat/participants/{participantId}/send-message. The goal is to trigger this action from a Terraform-based workflow engine that monitors for specific interaction states. When we execute the request with a valid access token and the correct participant ID, we consistently receive a 400 Bad Request error. The response payload indicates that the message body is malformed or missing required fields, despite following the documented schema for ChatMessage. We have verified that the participant ID belongs to an agent in an active session and that the token has the necessary permissions for conversation management. The issue appears to be related to the structure of the JSON payload sent in the request body, specifically how the canned response content is encapsulated within the message object.

Here is the current implementation of the HTTP request we are using within our Terraform provider:

POST /api/v2/conversations/chat/participants/{participantId}/send-message
Content-Type: application/json

{
 "messageType": "text",
 "content": {
 "text": "Thank you for contacting support. Your inquiry is being reviewed."
 }
}

The documentation suggests that the content object should contain the actual message text, but we are unsure if there are additional nested objects required for canned responses specifically. We have also tried including the cannedResponseId field directly in the root of the payload, but this results in a 422 Unprocessable Entity error. Is there a specific structure required for sending canned responses versus free-text messages? We need to ensure that the message is delivered instantly without requiring agent intervention, as this is part of an automated compliance workflow. Any insights into the correct payload structure for this endpoint would be appreciated.

Are you passing the type field as text or agentText? The 400 error usually comes from a malformed message object in the body.

Here is the exact payload structure that works for standard text messages. You need to wrap the content in the message object, not at the root level.

{
 "message": {
 "type": "text",
 "text": "This is a standard compliance message."
 }
}

If you’re using the PlatformClientV2 SDK, the method is postConversationsChatParticipantSendMessage. Make sure the participant ID is the one for the user (customer), not the agent. Sending to the agent ID often throws a 400 or 403 depending on permissions.

Also check your OAuth scopes. You need conversations:chat:send and conversations:chat:read. Missing read sometimes causes weird auth failures even if you have write access.