Custom Parameter to Buy Button

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Hi, I integrated a buy button on my php website using the js script.

The problem I am trying to solve: I want the user to be able to buy digital credits and with the webhook associate the credits with that user on my backend.

Ideally, I would like to pass a parameter ( user_id ) via the buy button and then get this user_id in the webhook call to my backend


Can I do that somehow?