javascript - How to call post method in Angularjs?

Hi I am developing Angularjs application. I am trying to call post method but i am not able to call post method.

Below is my code.

app.service("payementservice", function ($http) {
    this.makepayment = function () {
        debugger;
        var validatesecretekeyData = {
            merchant_email: "",//some data
            secret_key: ""//somedata

        };
        var validatesecretekeyUrl = "https://www.paytabs.com/apiv2/validate_secret_key";
        var responseservice = $http.post(validatesecretekeyUrl, validatesecretekeyData).success(function (response) {
        });
        return responseservice;
    }
});

Please find the screenshot here.

In request header i can see Request Method:OPTIONS but i made POST request? May i know am i doing anything wrong? Any help would be appreciated. Thank you.