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Ilened3Asked on September 9, 2017 at 1:17 AM
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BJoannaReplied on September 9, 2017 at 2:40 AM
You need to integrate your form with the Paypal. Inside of this guide, you can find how to do it:
How to Integrate Form with Paypal (Standard)
Inside of this guide, you can find how to pass a calculation to a payment field:
How to Pass a Calculation to a Payment Field
I have moved your other question to a separate thread and we will provide you an answer there shortly.