PRODUCTION SCENARIO
A data team builds a 60,000-request Message Batch from a new template. The batch is accepted with status in_progress, but the team suspects a misspelled field in params and wants to know quickly.
Which practice would have caught the error early?
Answering here is anonymous. Nothing is saved unless you sign in.
Show answer and explanation
Answer: Send one of the requests through the Messages API before building the batch
Each request's params are validated asynchronously and the errors come back only when processing of the entire batch has ended, so the documented safeguard is to check the request shape against the Messages API before submitting. The create call validates the batch envelope, not the params inside it, so its 200 proves nothing about the misspelled field. results_url is null until processing_status reaches ended. Polling more often changes how fast you see status, not when per-request errors appear.