I think it’s possible.
- The simplest way would be to create a number entry component on a donate page. Let the user type in a number, then pass that column value into the buy button.
- To make this better and prevent multiple users from updating the same column value at a time, create user specific donation pages using per user data and filtering. This will allow each individual user to set their own donate value. This will require a Public with Email or Whitelist privacy setting.
- The third option is to wait for the User Specific Data column type to be released. This should function the same as the second option, but without the extra rows for each user.