(function ( $ ) {
    'use strict';
    $('.datebook-paystack-number').keydown(
        function (event) {
            if (event.keyCode == 46 || event.keyCode == 8 || event.keyCode == 9
                || event.keyCode == 27 || event.keyCode == 13
                || (event.keyCode == 65 && event.ctrlKey === true)
                || (event.keyCode >= 35 && event.keyCode <= 39)
            ) {
                 return;
            }else{
                if (event.shiftKey || (event.keyCode < 48 || event.keyCode > 57) && (event.keyCode < 96 || event.keyCode > 105 )) {
                    event.preventDefault();
                }
            }
        }
    );
})(jQuery);
