Processes a payment in the store for a given user's cart through PayPal
Direct. The processDoDirectPayment(Map) method manages the process
of sending a request to PayPal, and handling the response appropriately.
parameters - A Map containing the values of the user's
submitted payment information.
A Map containing a least one key named
"resultCode", which contains a String parsable into an int,
representing the results of the processing. 0 for the resultCode
indicates success. Optionally, the Map may include
additional keys, such as "resultMessage", a string describing the
results of the processing.
public void processSuccessfulTransaction(java.util.Map parameters)