WAMID (WhatsApp message ID)
The WAMID (WhatsApp Message ID) is the unique identifier WhatsApp assigns to every message sent or received through the official API. It is used to correlate subsequent events with the original message: status updates cite the WAMID to indicate which message was delivered or read, and quoted replies use it to reference the quoted message.
The WAMID appears at two moments: at message creation, when the API responds to the send by returning the identifier, and in subsequent events, when status webhooks and replies cite it as a reference. Without storing it, updates become orphans: the system receives the notification that a message was delivered but doesn't know which one. It's the equivalent of a shipment's tracking number.
For integrators, the practices are straightforward: save the WAMID together with the message at send time, index it to find it fast when statuses arrive, and use it in the functions that require it, such as replying with a quote of a specific message or marking as read. In multichannel systems, it's worth keeping the WAMID next to the message's internal identifier, because every channel has its own ID scheme.
SendApp saves the WAMID of every sent message and uses it to attach status updates and replies to the right message in the conversation.
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