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What's the Difference Between WhatsApp Filtering and Number Validation? Detection Layers, Processing Order, and How to Merge Results
Number validation checks whether a number works as a phone number, is active, and what line type it belongs to; WhatsApp filtering checks whether the number has a WhatsApp account and what state that account is in. This article uses a customer list to explain what each checks, why one cannot replace the other, the recommended processing order, and how to tag and write back conflicting results.
How to Detect WhatsApp Number Validity: From List Formatting to Status Field Interpretation
A complete operational order for checking WhatsApp number validity: E.164 formatting and deduplication, device type filtering, platform registration and account status detection, plus the differences between three kinds of 'not found' under privacy boundaries and how to store results in separate fields.
