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## Description Move WhatsApp webhook callback override from WABA level to phone number level, allowing multiple phone numbers on the same WABA to have independent callback URLs. ## Type of change - [x] Bug fix (non-breaking change which fixes an issue) ## How Has This Been Tested? - Connect a WhatsApp Cloud inbox via embedded signup - Verify webhook setup succeeds and messages are received - Connect a second phone number on the same WABA — both should receive messages independently - Delete an inbox and verify only that phone number's override is cleared ## Checklist: - [x] My code follows the style guidelines of this project - [x] I have performed a self-review of my code - [x] I have commented on my code, particularly in hard-to-understand areas - [x] My changes generate no new warnings - [x] I have added tests that prove my fix is effective or that my feature works - [x] New and existing unit tests pass locally with my changes --------- Co-authored-by: tds-1 <tds-1@users.noreply.github.com> Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com> Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>