WhatsApp has your registration information
The Facebook-owned app has written, “When you register to use Payments, you provide your bank's name, partial debit card number, and debit card expiration date. You will also be asked to provide your ATM PIN or UPI PIN, or to set up an UPI PIN for payment transactions if you do not already have one. We receive your debit card details and ATM PIN or UPI PIN securely, and we do not retain this information.”
Whatsapp is the most popular instant messaging app in the country with over 220 million subscribers. There are other players like Google Tez and Truecaller which are also offering UPI-based payment services.
Facebook has admitted it may have "improperly shared" the personal data of up to 2.7 million people in the European Union, the bloc had announced last weeek. Facebook's data breach has sent the company into turmoil and raised questions about data protection for the entire tech sector. The recent incidents of breach has also once again highlighted the need for safety of personal data.