* @throws ServletException
*/
protected final void runDoExpressCheckoutPayment(HttpServletRequest _request, HttpServletResponse _response) throws ServletException {
DoExpressCheckoutPaymentRequestDetailsType request = APIUtil
.buildDoExpressCheckoutPaymentDetailsRequest(_request);
APICredential credentials;
try {
credentials = getAPICredentials(_request);
} catch (APIException e) {
writeException("EC-1003", "Error executing SetExpressCheckout API call", null, e, _response);
return;