In app billing

if((window.device && device.platform == "Android") && typeof inappbilling !== "undefined") {
        inappbilling.init(function(resultInit) {
            console.log("IAB Initialized");
            inappbilling.getPurchases(function(result) {
                console.log("PURCHASES -> " + JSON.stringify(result));
                if(result.length == 0)
                    showAD();
            },
            function(errorPurchases) {
                console.log("PURCHASE ERROR -> " + errorPurchases);
                showAD();
            });
        },
        function(errorInit) {
            console.log("ERROR -> " + errorInit);
            showAD();
        },
        {showLog: true},
        ["ad_free"]);
    } else {
        showAD();
    }