Paytm will integrate its digital payments services with IndiaStack, an open-stack platform that offers technology infrastructure for the unified payment interface (UPI), esign, digital lockers and electronic customer verification. The Paytm app on Thursday added a new security layer that it said would protect the customer's money if he loses the phone. “We have been using Aadhaar, and today 87% of the KYC we do is biometrically verified using Aadhaar. We talked to the team running Aadhaar and found that there is this whole stack of services that can be used,“ Paytm founder Vijay Shekhar Sharma said.