JIRA Servicedesk API for making templates

[Roman Gordienko]

Hi. I get started to maintain some JIRA Sevice Desk plugin(front-end part) and faced with API, that I'am not able to find into documentation:

jQuery.ajax({
    url: "$hcbaseurl/rest/servicedesk/1/customer/models",
    type: 'POST',
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    data: JSON.stringify(jsonData),

    success: function (data) {
        AJS.undim();
        JIRA.Loading.hideLoadingIndicator();
        jQuery('#loginHolder').html(ServiceDesk.Templates.Customer.loginForm(data));
    }
});

 I already know about AUI library and AJS/JIRA parts, but what about ServiceDesk? It returns HTML of login form, in case above. So, where can I find a description of this API?