Migrate an existing OTP / one-time-passcode flow from the Twilio Programmable Messaging API (self-built: generate code → send SMS → validate) to the Twilio Verify API (managed code generation, delivery, expiry, rate limiting, and Fraud Guard). Covers what Verify replaces, creating a Verify Service, replacing send + check logic, E.164 formatting with Lookup, bring-your-own custom codes, error-code translation, and a safe incremental cutover. Use when a developer is moving OTP/2FA delivery off Programmable Messaging onto Verify, or asks "should I use Verify instead of sending my own SMS codes?".
