[1][2] With 38 million users, PayPay is the largest Japanese mobile payment app.

[2] In October 2018, it began a QR code and bar code-based payment service, which was developed in collaboration with Paytm, an India-based payment service company.

[4][5] PayPay's server fell victim to a hacking attack, originating in Brazil, on November 28, 2020.

As per the operator of PayPay, a server containing personal and financial information of its entire userbase was compromised.

The company acknowledged that configuration flaws led to unauthorized access to information.