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.
A field-level reference for WA Lookup's ws_avatar service type: the synchronous request contract, the response fields, and what avatar and avatar_url carry.
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Learn how to bulk verify phone numbers from a CSV using WA Lookup's synchronous API and check WhatsApp account presence efficiently.
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Learn WhatsApp webhook architecture best practices by replacing complex handshakes with a synchronous REST API for real-time account-presence signals.
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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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Learn WhatsApp webhook automation best practices by replacing complex polling with a synchronous REST API for real-time number validation.
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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 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, response class, product code, and check time so later checks can update the evidence without erasing history.
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