Build a Referral Program in 3 Easy Steps

Its so hard to find sodtware to automate this for cheap, im not spending £150 per flipping month.

Hi! I want to have a referral program with similar businesses in my field that we have a common clientele, I would appreciate your advice on how I build the system for such cooperation, assuming that both types of businesses do not receive payment on the Internet but via bank transfer, and there is no way to track cookies, how can we reward each other, what is the correct method to work with? Thank you!