What is difference between wa_id we receive in payload for message event and sender's actual mobile number? I am confused like whether I can use wa_id to send messages to user or I have to use user's phone number?
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wa_id — String. The customer's WhatsApp ID. A business can respond to a customer using this ID. This ID may not match the customer's phone number, which is returned by the API as input when sending a message to the customer.