Registration check guides
Practical guides on one thing: checking whether a phone number is registered on WhatsApp and using that result. Learn how to integrate the check, store and refresh results, and read them correctly — without mistaking a request error for "not registered".
Improve CRM data hygiene with whatsapp business username identity mapping. Learn to use synchronous API checks for registration and account presence signals.
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WA Lookup accepts one submitted phone number, runs the selected registration check, and returns the result in the same HTTP response. This guide explains where that synchronous result adds value, what to store, and how to keep failures separate from a completed false result.
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A WhatsApp registration result is a point-in-time observation, not a permanent property of a phone number. Store the normalized input, completed result, local outcome class, product code, and check time so later checks can update the evidence without erasing history.
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