/// <remarks/>
 public void GetExpressCheckoutDetailsAsync(GetExpressCheckoutDetailsReq GetExpressCheckoutDetailsReq, object userState) {
     if ((this.GetExpressCheckoutDetailsOperationCompleted == null)) {
         this.GetExpressCheckoutDetailsOperationCompleted = new System.Threading.SendOrPostCallback(this.OnGetExpressCheckoutDetailsOperationCompleted);
     }
     this.InvokeAsync("GetExpressCheckoutDetails", new object[] {
                 GetExpressCheckoutDetailsReq}, this.GetExpressCheckoutDetailsOperationCompleted, userState);
 }
 /// <remarks/>
 public void GetExpressCheckoutDetailsAsync(GetExpressCheckoutDetailsReq GetExpressCheckoutDetailsReq) {
     this.GetExpressCheckoutDetailsAsync(GetExpressCheckoutDetailsReq, null);
 }