JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Can you please explain a bit more on your question. If you are wondering if there is an additional charge for using the the payment field, there is not. The amount you place in the field, will be the amount the will be charged to the user. There is not additional charge.
You may also add shipment and taxes into the price.