I consistently do the same shops, sometimes swapping the location, but for the same company, and sometimes I get the bonus but sometimes I don’t. There isn’t anything in the instructions that tells me what to do to receive the bonus, and I don’t do anything differently each time.

does anyone have recommendations or insight on how to get shop bonuses? Is this just random, or is there a method to it?

If a shop shows a “bonus” will you always get it if the shop is approved? Or is that just up to their discretion?