These days you can just upload the file into one of many platforms and let them handle the payments (and even tax and VAT) instead. As it's related to gaming, a

These days you can just upload the file into one of many platforms and let them handle the payments (and even tax and VAT) instead. As it's related to gaming, a PDF on itch.io would have been very easy and cheap solution (you can set any profit sharing percentage there, including 0%, with default of 10%).