Registration check guides
Practical articles about the product's exact purpose: checking whether a phone number is registered on WhatsApp and returning that observation synchronously. Learn how to integrate, store, interpret, and refresh results without turning errors into false values.
Learn WhatsApp API automation best practices. Transition from complex webhooks to synchronous REST APIs for efficient number verification and account checks.
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WA Lookup accepts one E.164 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, response class, product code, and check time so later checks can update the evidence without erasing history.
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