Отправка запроса к API

window.onload = function () {
    document.getElementById('rest-api-test').onclick = function() {
        axios({
            method: 'post',
            url: '/wp-json/forms/v1/send/1',
            headers: {
                'Content-Type': 'application/json',
                'X-WP-Nonce': window.themeVars._wpnonce
            },
        });
    };
};