Blocking method to create a Source object. Do not call this on the UI thread or your app will crash.
See Create a source.
a Source, or
null if a problem occurred
a set of SourceParams with which to create the source
optional, see Idempotent Requests
Optional, the Connect account to associate with this request. By default, will use the Connect account that was used to instantiate the
Stripe object, if specified.