discoveryCustomScheme property
As per the UPI Linking Specification,
each iOS UPI app that can be invoked directly for UPI payment must
implement the custom scheme upi. For the purpose of discovering an iOS
UPI app without ambiguity, we need any other unique custom scheme that the
app implements. Any such unique custom scheme, if available, is stored in
this attribute to be used for discovering this app.
Implementation
final String? discoveryCustomScheme;