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 PHP MySQL Webhook Sync Engine (Server A -> Server B) - Test Suite
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 [PASS] HMAC SHA-256 signature generation & verification
 [PASS] HMAC signature rejection on tampered payload

[!] Integration Error: Database Connection Error [DB: destination_db]: SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: YES)

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 Test Summary: 2 Passed, 0 Failed
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