I am building an android application which I thought should have a best payment system that should free user from entering details. I have gone though UPI but no idea how to integrate this.
Make sure you have an internet connection. Check for mistakes and extra or missing numbers. Make sure you use the right UPI PIN with the right bank account. You can change or reset your UPI PIN.
Upi.com is UP and reachable by us.
From July 2021, Apple iPhone, iPad, and IPod Touch users in India can use UPI on App Store and iTunes Store. NPCI International Payments Limited (NIPL) is planning to extend UPI to markets such as United States, West Asia and Europe.
It's difficult to find well documented files about how to implement the UPI integration on UPI's website, but below I am mentioning some of the links which you can refer to. Cross refer all documents, one document alone won't help:
https://digidhan.mygov.in/pages/pdf/sbi/NPCI%20Unified%20Payment%20Interface.pdf
To integrate UPI SDK in you android app you have to partner with a bank which is offering this service. Only UPI enabled banks are allowed to act as PSP (Payment service Provider). Some banks which are offering this service are: Yes Bank, RBL, ICICI Bank, Axis Bank.
Once you have the SDK it's pretty much Plug n Play and will hardly require a day's work. Although the bank that is offering you the SDK will review the developed app to see if it matches their security standards.
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