A shopper uses his credit card to pay for goods in a grocery in Nice, France, April 3, 2019.

Image used for illustrative purpose. An application to pay for taxi service using a cell phone through a bank card reader is pictured in this picture illustration in Mexico City, Mexico, April 4, 2019.

A man withdraws cash from an automated teller machine (ATM) in Peshawar, Pakistan April 1, 2019.

A woman withdraws cash from an automated teller machine (ATM) in San Salvador, El Salvador April 4, 2019.

Wifi signal icon on a debit card is seen in this picture illustration in Mexico City, Mexico, April 4, 2019. REUTERS/Edgard Garrido - RC1F7D078B20

A fruit seller swipes a customer's debit card at a roadside market in Mumbai, India, April 2, 2019.

Image used for illustrative purpose. A salesman registers a credit card for a customer at a shop in Peshawar, Pakistan April 1, 2019. REUTERS/Fayaz Aziz

An automated teller machine (ATM) is seen in a bank in San Salvador, El Salvador April 4, 2019.

A vendor weighs vegetable next to an advertisement of Paytm, a digital payments firm, hanging amidst his vegetables at a roadside market in Mumbai, India, April 2, 2019.

A taxi driver shows an application to pay for taxi service using a cell phone through a bank card reader in Mexico City, Mexico, April 4, 2019. Image for illustrative purposes.

A cashier processes a customer's credit card during payment at a cafe in San Salvador, El Salvador April 4, 2019.

An automated teller machine (ATM) is seen in a bank in San Salvador, El Salvador April 4, 2019.

Bank card readers for payment via a cell phone application are pictured in this picture illustration taken April 4, 2019.

An automated teller machine (ATM) is seen in a bank in San Salvador, El Salvador April 4, 2019.