Hi,
I am developing an e-commerce for a merchant (using MVC5 and C#).
I just need a paypal button for instant payment.
Following this guide https://developer.paypal.com/docs/checkout/# I found out some troubles.
My customer, from his business account, has access to some API credentials (username, passowrd and signature).
I do not understand where to use these credentials.
The menthioned guide requires just the client id from the app on my developer account.
I think there sould be another way. I do not want to add my customer account to my app.
If someone could be of help I'll be really greatfull.
Thanks in advance.
