An intriguing possibility might be for Citibank to offer an Apple Pay, Venmo, Tez, Alipay, Walmart Pay, Facebook, PayPal, or Android Pay credit card. Since PayPal is experimenting with a Venmo Visa that makes a lot of sense. Such a card would allow a customer to pay with either their digital wallet balance or with a Visa or MasterCard line of credit. The customer would also get the ability to access his or her line of credit via the payment app.