if (get_field('checkbox_field_name')) {
echo '<div class="discount_bar">';
// echo '<div>'.the_field('test_field_').'</div>';
echo '<span> Use Coupon Code </span>';
echo '<a class="selectcoupon" href="#couponlink" target="_blank" >';
echo ''.the_field('coupon_code').'';
echo '</a>';
echo '</div>';
}