parse
Parse a Push URI string into a PushCredential. Format: pushauth://push/issuer:accountName?r=regEndpoint&a=authEndpoint&s=sharedSecret&d=userId Format: mfauth://push/issuer:accountName?r=regEndpoint&a=authEndpoint&s=sharedSecret&d=userId
Return
A PushCredential.
Parameters
uri
The URI string.
Throws
if the URI is invalid.