Payment Method Synchronous
Blocking method to create a PaymentMethod object. Do not call this on the UI thread or your app will crash.
See Create a PaymentMethod.
a PaymentMethod or
null if a problem occurred
params with which to create the PaymentMethod
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.