Wordpress rest API end point

 add_action('rest_api_init', function () {

register_rest_route('kanha/v1', '/get-all-orders', [ 'methods' => 'GET', 'callback' => 'get_all_orders_by_email', 'permission_callback' => '__return_true', ]); }); function get_all_orders_by_email($params) { $all_params = $params->get_query_params(); $email = $all_params['email']; //here your sql query by email return $email; } Arguments Reference

https://developer.wordpress.org/rest-api/extending-the-rest-api/adding-custom-endpoints/#arguments