How to Integrate an SMS Verification API: The Complete Call Chain for Getting a Number, Receiving Codes, and Closing the Order

The core of an SMS verification platform API comes down to four actions: authenticate and fetch config, request a number, wait for the code, and complete or cancel—this article walks through each step, including what to store, polling intervals and timeouts, state machine return codes, and how short-lived vs. long-lived numbers change your code structure and fault tolerance.