You're purchasing OnlySheets Integration with Gumroad.
Check your email for the link to the sheet.
Sell access to any google sheet via Gumroad.
No need to set your permission level on a sheet to "Anyone with a link"
Your sheet, Your Choice.
A google script will handle adding the buyer as a viewer.
You can also sell Edit access, if you wish.
A google Sheet Template and code.
- A google Sheet Template and code.