request has unresolved parameters

function executeAddPayment(){
  debugger;
  var organizationUrl = Xrm.Page.context.getClientUrl();
  var id = Xrm.Page.data.entity.getId().replace('{', '').replace('}', '');
  var query = "invoices("+id+")/Microsoft.Dynamics.CRM.testpayment";

  Alert.show("This will is partial payment", "Please make sure the balance is correct.",
    [
      new Alert.Button("Check", function (){executeUserAction(organizationUrl, query)}, true, true),
      new Alert.Button("Not now")
    ], "QUESTION", 500, 200);
}



function executeUserAction(organizationUrl, query){
  debugger;
  var req = new XMLHttpRequest();
  req.open("POST", organizationUrl + "/api/data/v8.0/" + query, true);
  req.setRequestHeader("Accept", "application/json");
  req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
  req.setRequestHeader("OData-MaxVersion", "4.0");
  req.setRequestHeader("OData-Version", "4.0");
  req.onreadystatechange = function () {
      if (this.readyState == 4) {
          req.onreadystatechange = null;
          if (this.status == 200) {
              var results = JSON.parse(this.response);
              if (results.Status==true) {
                Alert.hide();
                Xrm.Page.data.refresh(false);
              }
          } else {
              Alert.hide();
              Xrm.Page.data.refresh(false);
              var error = JSON.parse(this.response).error;
              alert(error.message);

          }
      }
  };
  req.send();
}