Hi!
I currently sell "100 Captions for Photographers" in my education shop. I have all of the captions categorized in Trello. When a buyer purchases the captions via shopify they get a PDF with a link to the trello board. The board has to be public in order for the board to pull up from that link. I have tested it and when it is made private, they no longer have access from the PDF.
The problem is, being a public board means that anyone can do a google search and find these captions for FREE! This is obviously a major issues.
What is the solution?