I have added a notes section to the downloadable PDFs that gives ideas for adapting the Hard Sell rules for use inside another game.

For example, you are playing a tabletop RPG and one of the players wants to trade a valuable item with another player or an NPC. The new notes will help with adapting the rules to work in that context to allow for a productive negotiation with a reasonable outcome.

This was always have these rules were intended to be used when employed as a drop-in module like that, but I hadn't made that explicit in the rules.

Enjoy!