Required Google Spreadsheets,Microsoft Excel freelancer for Google script for the sale of google sheets document job

A Google Sheet has been designed for the public (subscribers), either for sale or in exchange for their subscription.

The constraints are the following:
-the sheet cannot be translated into an Excel document because of the Query formula.
-sheets are permission-based files. I'd like Subscribers to have unique access to the main template for download, without them seeing the file owner as well as other Subscribers.
-the process to be automated from subscription until the document is owned by the Subscriber.

Skills & Expertise Required

Google Spreadsheets Microsoft Excel