I have set validation to check valid format of UPI.
String validateUpiID(String value) {
String pattern = '[a-zA-Z0-9.\-_]{2,256}@[a-zA-Z]{2,64}';
RegExp regExp = RegExp(pattern);
if (value.isEmpty) {
return 'Please Enter UPI ID';
} else if (!regExp.hasMatch(value)) {
return 'Please Enter valid UPI ID';
}
return "";
}
But Now I'm stuck there, How do I check that entered UPI is exist or in working mode ?