Don't know why I can't seem to find this in the docs.. I have two simple Smart Payment Buttons on a page for people to send donations and I want to pass in a reference of each button so both the user and more importantly the site owner know which button was used as they are for different donation types. I was expecting step 4 of this page https://developer.paypal.com/docs/checkout/integrate/ to have an option to pass in a reference during the createOrder process, is something like that not possible?
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