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Errors and retries

Errors and retries. Verified API reference for secure server-side integration.

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Verified API reference for secure server-side integration. Credentials stay server-side.

Documented HTTP errors

HTTPMeaningAction
400Missing parameters, invalid format, unsupported channel or insufficient fundsWhat to validate before launch
401API key is missingCredentials stay server-side.
403API key is invalidCredentials stay server-side.
500Unexpected provider errorRetry safety

Retry safety

Before retrying a send, reconcile returned IDs and campaign state to avoid duplicate messages. Never log API keys or recipient numbers.