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### Problem WhatsApp Cloud channels already handle Brazil/Argentina phone number format mismatches (PRs #12492, #11173), but Twilio WhatsApp channels were creating duplicate contacts when: - Template sent to new format: `whatsapp:+5541988887777` (13 digits) - User responds from old format: `whatsapp:+554188887777` (12 digits) ### Solution The solution extends the existing phone number normalization infrastructure to support both WhatsApp providers while handling their different payload formats: ### Provider Format Differences - **WhatsApp Cloud**: `wa_id: "919745786257"` (clean number) - **Twilio WhatsApp**: `From: "whatsapp:+919745786257"` (prefixed format) ### Test Coverage #### Brazil Phone Number Tests **Case 1: New Format (13 digits with "9")** - **Test 1**: No existing contact → Creates new contact with original format - **Test 2**: Contact exists in same format → Appends to existing conversation **Case 2: Old Format (12 digits without "9")** - **Test 3**: Contact exists in old format → Appends to existing conversation - **Test 4** *(Critical)*: Contact exists in new format, message in old format → Finds existing contact, prevents duplicate - **Test 5**: No contact exists → Creates new contact with incoming format #### Argentina Phone Number Tests **Case 3: With "9" after country code** - **Test 6**: No existing contact → Creates new contact - **Test 7**: Contact exists in normalized format → Uses existing contact **Case 4: Without "9" after country code** - **Test 8**: Contact exists in same format → Appends to existing - **Test 9**: No contact exists → Creates new contact Fixes https://linear.app/chatwoot/issue/CW-5565/inconsistencies-for-mobile-numbersargentina-brazil-and-mexico-numbers