No documentation and a low level help desk.

Is there something specific what you did not find in their documentation?
https://formidablepro.com/knowledgebase/

Formidable support is, yeah, pretty much 100% the opposite of what you said.

No documentation and a low level help desk.

You couldn’t be more wrong. I’ve been using Formidable — free as well as pro — for years. The documentation is thorough, and the support is terrific.

Ok Michael and InSightGraphicDesign, if the documentation is thorough, and the support is terrific, give me a link to documentation about the IPN respnose of PayPal.

It’s impossible work with custom payment without this information.

Here’s the documentation for how to set up & use PayPal:
https://formidablepro.com/knowledgebase/formidable-paypal/

This functionality requires the premium add-on. For support, ask your questions in their user forum:
https://formidablepro.com/help-desk/

Are you kidding me? This are examples that I know very well.

I have already asked the help desk, do not even know what I mean…

I just had to interface your payment data with my archive. I will do everything by myself, is not the first time.

I was hoping to use a graphical interface ready but your is good only for small jobs.