I have a question about creating a custom form

Hello,

I would like to create a form that integrates with PayPal, so that our customers can pay an invoice online. The form would need to have a field for the user to fill in a variable amount. Is there a template that does that?

I have attached a mock-up, with notations in blue, so you can see what I would like to do. Please advise how I should proceed. Perhaps JotForm has a template that does this (?) or will I have to further research the process with a PayPal technical support advisor? If the latter, please tell me what I should ask PayPal for. (I do not write dev. code.)

It is possible to integrate our forms with the Paypal and let the users fill in a variable amount. 

Inside of this guide, you can find how to integrate your form with Paypal:

How to Integrate Form with Paypal (Standard)

Also, please check this guide:

PayPal Forms

To let the users fill in a variable amount you should use Payment Type > User Defined Amount option. 

I saw that you already created one form. You can also check our Template Gallery. 

Let us know if you need further assistance.