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I'm not sure I understand what do you mean by 'purpose' please?
If you meant the payment type this is how you can change that:
Please let us know so we can be able to assist you.
The form passes in formation to Paypal and we have more than one form that accepts donaitons I need a way to tell them apart in paypal. How do I do that?
I think the way to do it is to pass something to the purpose field of paypal which seems to come from the subtext of the field? here is what I am seeing on one of the forms paypal submissions
Unfortunately, this seems to be not currently possible to forward an additional information to PayPal and show it in their reports. Only date collected within the field can be forwarded at this time.