UPI – Unified Payment Interface
NPCI (National Payments Corporation of India) announced the bank applications for the Unified Payment Interface.  UPI is a payment system that allows money transfer between any two bank accounts by using a smartphone and UPI Apps. UPI apps allows a customer to pay directly from your bank account to different merchants both Offline and Online without entering credit card details, IFSC code, or net banking/wallet passwords.
As of today, below Banks have upgraded their Mobile Banking Apps with UPI Functionality.
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UPI Money Transfer 
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Pay anyone anytime directly
  through your bank account. Securely and Instantly! 
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UPI allows instantly transfer
  money to using IMPS payment framework. 
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Unified Payment Interface app from
  United Bank of India : Add any Bank account 
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UCO UPI-One App for all your
  Banking needs 
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LOTZA is Federal Bank’s UPI PSP
  application. 
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VIJAYA BANK UNIFIED PAYMENT
  INTERFACE 
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M-Pay UPI: One App for all your
  Bank accounts & payments from South Indian Bank. 
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Andhra Bank ONE One App for all
  your Banking needs. 
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KBL SMARTz (Karnataka Bank Secure
  Mobile App for Rapid Transactions) UPI 
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Unified Payments Interface (UPI)
  Application by Axis Bank 
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Bank of Maharashtra - Unified
  Payment Interface 
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CSB-UPI 
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Unified Payment Interface (UPI)
  Application of Canara Bank. 
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UPI Application - TJSB Sahakari
  Bank Ltd . 
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Vijaya Bank Mobile Banking 
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DCB Bank UPI App 
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Andhra Bank UPI Apps 
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ICICI Mobile Banking - iMobile UPI
  Apps 
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UPI Apps is safe as the customers only share a virtual address and provide no other sensitive information and you will be able to perform almost all transaction like Merchant Payments, remittances, bill payments among others.
Through UPI Apps, the transaction limit is Rs.1 lakh. Users can make an in-app payment for goods or services purchased online and through UPI app the transaction information is verified and followed by entry of a secure PIN for completing the purchase.