Hi everyone! I have a business account and a elearning platform where I accept payments on behalf of other PayPal accounts (that is, I create the orders but the money gets transferred to my customer's PayPal accounts).
My problem is that I can't find the API username I should give my customers so they can give me that permissions. I've tried with my account email address, my PayPal merchant id, my full name... but I always get a "Please enter valid API username" on the customer test account when trying to give these permissions.
Can anyone help me here? How can I find the API username I should give my customers so they can allow me third party permissions?