Don’t complicate the exchange.
If I do something for you, accept it with grace.
There don’t have to be any checks and balances involved. You don’t owe me anything in return.
Just say thank you. That’s all I need to hear.
Acknowledge that something was done, or value was provided, or that you are grateful….
…remember the gesture, and move on.
All I need to hear is thank you. Your happiness and satisfaction is why I did it in the first place.