We advise you to do the following.
Ask the user to print the pages they are missing. Then, cancel the payment for those pages in the Admin Panel. Staff can also go with the customer and print the missing pages using the “Print with Password” function, so the customer does not need to pay again.
A reason for missing pages can also be due to an unprintable pdf file.
If the pdf file contains several pages and not all pages are printed, the file can be unprintable.
In many cases, this issue can be solved by flattening the pdf file.
We suggest that the pdf file is flattened using this online pdf flattening method.