$.ajax({
    url: site+"/api/rest/products",
    type: "GET",
    headers: {
        "X-Oc-Merchant-Id": '123'
        },
        dataType: "json",
        contentType: 'application/json: charset=utf-8',
        async: true,
        xhrFields: {
            withCredentials: true
        },
        crossDomain: true,
        success: function(response) {

            if (response.success) {
                console.log(response.data);
            } else {
                console.log("Error");
            }
        },
        error: function(error) {
            console.log("Error");
        }
});