We are trying to automate the sending of canned responses during an active chat interaction using the Genesys Cloud Conversations API. The specific endpoint in question is POST /api/v2/conversations/chat/messages. We have successfully retrieved the conversation ID and the participant ID for the customer, but the actual message send operation consistently fails. The request body includes the standard required fields: type, toParticipantId, and content. We are using the genesyscloud provider in Terraform to manage the infrastructure, but for this runtime API call, we are using a simple Python script with the requests library to handle the dynamic interaction flow. The JSON payload we are sending looks like this: {“type”: “text”, “toParticipantId”: “12345-67890-abcdef”, “content”: [{“type”: “text”, “text”: “Thank you for contacting support.”}]}. We have verified that the OAuth token is valid and has the necessary scopes for conversation:write. The HTTP response we are getting is a 400 Bad Request. The error message in the response body is quite generic, stating “Invalid message content”. We have tried varying the content structure, including using just a plain string instead of the array of content objects, but the result is the same. We are also checking the conversation state to ensure it is still active and not closed. The participant ID seems correct as we can fetch the participant details using the GET endpoint without issue. We are running this from a server in Europe/Berlin, so timezone shouldn’t be an issue, but we want to rule out any regional API quirks. Has anyone encountered this specific 400 error when sending chat messages via the API? We are looking for the exact JSON structure required for the content field to avoid this validation error. We have checked the developer documentation multiple times, but the examples are somewhat sparse on error handling details. We are also considering if there is a rate limiting issue, but the 400 status code suggests a validation problem rather than a 429. We need a working example of the request body that passes validation. We are stuck on this step and cannot proceed with the automation. The script halts on this error, preventing the canned response from being delivered to the customer. We have also tried sending the message as an agent participant, but that requires additional permissions which we have not yet configured. We are focusing on the customer-facing message for now. Any insights on the exact content schema would be appreciated. We are using Python 3.9 and the latest version of the requests library. We have also logged the raw request headers to ensure the Content-Type is set to application/json. The Accept header is also set correctly. We are not seeing any other errors in the logs. We are just getting the 400 back immediately. We have also tried using the SDK, but the Python SDK for Genesys Cloud is not as mature as the JavaScript one, so we are sticking to the REST API for now. We are open to switching to JavaScript if that solves the issue, but we would prefer to stay in Python. We have also checked the interaction ID and conversation ID to ensure they match. We are confident the IDs are correct. We are just missing something in the payload structure. We are looking for a concrete example of a successful request body. We have also tried omitting the content type array and just passing a string, but that also fails. We are not sure what the API is expecting. We have also checked the API version to ensure we are using v2. We are not using any deprecated endpoints. We are just trying to send a simple text message. We are not trying to send attachments or rich content. Just plain text. We are stuck. We need help.
You’re missing the type field in the payload object itself, or more likely, you’re sending text when the API expects type: "text" and the content inside a content object. The 400 usually means the JSON structure is off.
Here is the exact shape that works in the Node SDK. Note how content is an object, not a string.
const platformClient = require('genesys-cloud-purecloud-platform-client');
const sendChatMessage = async (conversationId, toParticipantId, text) => {
const conversationsApiClient = platformClient.ConversationsApi;
const messageBody = {
type: "text",
toParticipantId: toParticipantId,
content: {
text: text
}
};
try {
const result = await conversationsApiClient.postConversationsChatMessages(
conversationId,
messageBody
);
console.log("Message sent successfully:", result.body);
} catch (error) {
console.error("Failed to send message:", error);
}
};
Also double-check your OAuth scope. You need conversations:chat:write. If you’re using a bot token, it might not have that. The error doesn’t always scream “permission denied” on this endpoint, it just throws a 400 with a vague validation error.