create
Creates a SavedPaymentMethod from a JSON string.
Use this method to deserialize a saved payment method. It takes a JSON string that has been created with toJson.
The JSON string is compatible with the iOS version of the Datatrans SDK.
Return
The decoded SavedPaymentMethod or one of its subclasses, if successful. null if jsonString is invalid or payment method is not supported
Parameters
json
The JSON string representation.