Buy groceries. Earn points. Use points for cheaper gas at the station the same company owns. Fill the prescription at the pharmacy inside the store. Pick up a prepared dinner on the way out.
Four businesses. One customer. One card tying all of it together.
Gif by LantanaFoods on Giphy
That is not four separate services offered for convenience. It is a loop, and once you are inside it, leaving costs you something.
The company is not really selling groceries. It is selling a system where every part makes the other parts stickier.
And the fuel discount, which feels like the most generous thing any retailer does for you, is the cleverest piece of the whole arrangement.
Let me show you the mechanics, because once you see them you can use the loop instead of being used by it.