I am generating a marketpayment app, which has multiple clients, in this app I need to be able to save users' cards so they can use it again later.
The question is, the user, I generate it with the access_token of the app? And then I only issue the purchase with the customer's token?
EDIT
On our site we have many products from many stores, so the user does not have a shopping cart as such, enters a product and buys that product, but I need users to save their cards only once, and that that card can be used in the multiple stores we have.