OnePlus Pay is the latest smartphone OEM-provisioned digital wallet platform on the market. To date, it only works in China, although it could expand to other markets later. As with other similar services, it allows a user to store card details and pay for things like public transport.
https://www.notebookcheck.net/OnePlus-launches-its-own-payment-service-in-its-home-country.459026.0.html