Good morning, We have a simple app where customers click on a link and tip a driver who delivered a package for them. The tipping portion uses paypal smart buttons. All the tip amounts go to a central account and later are paid out to drivers. Does the button allow providing a field like reference-id that can be recorded when taking payments. (We will fill it with the driver phone number for e.g so we know it during reconciliation from central account). Thanks
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