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If you hit the rate limit and receive a 429 "Too Many Requests" response, wait a while and try again. Information on how to check your messaging limits is available in your account.
We enable a queuing feature on our side, where we respond with 202 "Accepted" instead of the usual 200. We will store the messages in a queue based on your decision. After that, if the message hasn’t been processed, you’ll receive a 429 response.