How to Approve Real Users and Block Fake Accounts at Sign Up with Lookup and Verify in Python

A Twilio tutorial presents a Python and Flask sign-up workflow that combines Lookup and Verify APIs to reduce fake-account creation while maintaining a straightforward user experience. The process first screens phone numbers by line type, optionally checks whether a line is active and reachable, compares submitted first and last names with authoritative data through Identity Match, and finally sends an SMS one-time passcode to confirm phone ownership. The sample application uses environment-based Twilio credentials, returns reason codes for rejected applications, and permits exact or high-partial name matches to accommodate common name variations. It also discusses regional availability and carrier-approval limitations for Identity Match, testing through sandbox credentials and magic numbers, and the benefit of ordering lower-cost Lookup checks before the more expensive identity and verification requests.

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