Authorize.net CIM M2 - General Usage
When a customer is making a purchase on your store, he or she will be able to see the Authorize.net option.
If they already have an account, they will be able to use on their saved credit cards which are identified by only the last four digits for security reasons.
The customers can also enter new credit card information.
Once they have added in the new card information, they can see and delete their saved credit cards by navigating to Manage Saved Cards, under 'My Account' side menu