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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 ca...

How can I pass the extra data of type string while redirecting the user to my simple checkout form so that when the webhook notification or relay response is trigger we get that data in the request bodyI want to identify the user that this is the sam...