Pay for network introduction?

I was looking for a supplier of a specific product(not difficult to find) and a woman(friend of a friend) connected me to some company. Should I, the buyer, pay her any money for this?

No, but a hand written thank you note would be well appreciated.

No, if anything, the seller would reward her for introducing them to a new customer, but you shouldn’t have to do anything other than polite thanks.

alright, hand written note it is then. thanks