Is there a way to pay a flat rate per document for editing capabilities in PDF?

Hi @Susan24220703mlaa 

Sorry for the delayed response.

As mentioned above that, you want a plan to just pay per document that you edit. But unfortunately, we do not have such a plan under our subscription options. Here is a help document you can refer to for understanding plans and pricing:

https://www.adobe.com/in/acrobat/pricing.html

Thanks,

Harsh