The client has webmessaging:conversation:send scope. Standard text messages work fine. I verified the endpoint path matches the documentation for v2. The issue persists across multiple orgs using the same Terraform module for app creation.
Is there a specific capability flag missing on the application resource in the CX as Code definition? Or is the API versioning for structured messages still unstable in the Amsterdam region? I need to automate this for outbound engagement flows. Hardcoding text is not an option for our UI requirements.
According to the docs, they say the quickReplies array requires explicit type fields for each item, not just title and value. Try this payload structure instead:
The root of the issue is that the quickReplies array items in the Genesys Cloud Open Messaging API require an explicit type field to validate the schema correctly. The payload sent in the initial post omitted this field, causing the 400 Bad Request error. The suggestion above correctly identifies the missing type property for each quick reply item.
To resolve this, ensure every item in the quickReplies array includes "type": "quickReply". This is a strict requirement for structured messages in web messaging. Below is the corrected JSON payload and a curl example for testing.
Add "type": "quickReply" to each object in the quickReplies array.
Verify the OAuth token has webmessaging:write scope.
Ensure the conversation ID and participant ID are valid.
This is typically caused by the schema validation strictly requiring the type field on every item within the quickReplies array, which was missing in the original payload.
The suggestion above is correct. When I provision these messaging templates via Pulumi, I always ensure the JSON structure matches the strict Open Messaging spec. The API rejects the request if the type property is absent on the individual reply objects. Here is the corrected payload structure that resolves the 400 error:
I also recommend checking your OAuth client scopes if you are managing this via Infrastructure as Code. Ensure the client has the webmessaging:participant scope. If you are using a custom provider in Pulumi, sometimes the generated client defaults to minimal scopes unless explicitly overridden. The fix is straightforward once you add the missing type keys to the array items.
This is actually a known issue… The schema validation on the Open Messaging API endpoints is notoriously strict, especially when dealing with structured payloads. While the suggestion above correctly identifies the missing type field, the root cause often stems from how the payload is serialized or constructed upstream, particularly if you are using an SDK that might strip unknown fields or if Terraform is managing the OAuth client with restrictive scopes.
In my Node.js serverless setups, I typically avoid relying on the SDK’s default serialization for these specific messaging types because it can be inconsistent. Instead, I construct the JSON explicitly to ensure the schema matches exactly what the API expects. Here is a robust way to handle this in a Lambda function using the Genesys Cloud SDK, ensuring the quickReplies array is properly formatted:
Also, double-check your OAuth scopes. The Terraform-provisioned app needs webmessaging:write and conversation:write. If the scopes are missing, you might get a 403 instead, but a malformed payload with insufficient permissions can sometimes trigger confusing 400 errors due to pre-validation steps. Ensure your EventBridge trigger or Lambda handler has the correct permissions attached.