<script type="text/javascript">
function sample() {
   setTimeout(function() {
       window.open('<?php echo esc_attr(wpcoupon_coupon()->get_go_out_url()); ?>', '_self');
   }, 5000);
}
</script>

<button class="ui right labeled icon button btn btn_secondary" onClick="sample();">
<i class="copy icon"></i>
<span><?php esc_html_e('Copy', 'wp-coupon'); ?></span>