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How to send extra data/field in the simple checkout form payment to get the same data in reponse

I'm using the Simple Checkout form to do the payment where I have created the item with price and use the integration form button in my website, Now I want to know which one of my user has clicked on that button and complete the payment so that we can give him some reward from my website?

Flow that i'm assuming should be -
when user clicks on "Buy Button" we will send users unique id with the form hidden input field in the simple checkout form
when user complete the payment, that same unique Id will be send in either webhook or relay response
and we will extract the unique Id from the response and will update the user.