You wrote a PHP script that probably runs a PDF generator tool with a few arguments from user input. What value does this provide to warrant existing as a stand-alone service? A grandmother could mock this up in Google Sheets, using Google Images results as a reference in less time than it would take to input the info on your site + pull out their CC.

Are you actually verifying bank statements?

While I also struggle to see the value in a service like this, I think the comment regarding a grandmother and google sheets is a tad unnecessary. Sometimes people build things just because they want to, or it brings some value to them. It doesn’t have to appeal to a wider market, and that’s fine.