I am looking for a way to create a subscription from a previous payment a customer has made through an API call or another way instead of having to login to the Merchant Interface. I have done some research but currently have not found a way to do this. Is this possible?

Also, in the Merchant Interface, there is a "View Rebillable Transactions" button that allows you to submit a charge to a card the customer has used in the past. Is it possible to have this same functionality using an API?

Any help is appreciated!