After using Paypal web site and subscription payments on my sites for years I just realized that I can actually add my MRB code and earn referral bonuses from new Paypal customers. I have no idea what to add to the payment code though. Paypal says it can be done but of course they don't provide simple instructions. Does anybody know what to use in the code?
Of course right after I posted this I found the answer. Incase anybody else is wondering here it is. <input type="hidden" name="mrb" value="YOURCODEHERE">