This is a good point, and we are still trying to figure out how to price things fairly. Depending on the type of PDF, whether it is a simple receipt or a large multi-pages report, associated costs are very different on our side. At this time, we rely on other proprietary software that we are aiming to replace but that incur high costs on our side as well.

Edits and corrections on generated PDFs is not provided as the PDFs are signed as-is, however you can attach the metadata to the PDF and rerender with the modifications.