private PaypalSOAPProxy(String apiUsername, String apiPassword, String apiSignature)
     throws PayPalException {
   super(apiUsername, apiPassword, apiSignature);
   caller = new CallerServices();
   caller.setAPIProfile(profile);
 }
 private PaypalSOAPProxy(APIProfile profile) throws PayPalException {
   super(profile);
   caller = new CallerServices();
   caller.setAPIProfile(profile);
 }