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/**
 * @snippet       Edit "Have a Coupon" message @ WooCommerce Checkout
 * @how-to        Watch tutorial @ https://businessbloomer.com/?p=19055
 * @sourcecode    https://businessbloomer.com/?p=21348
 * @author        Rodolfo Melogli
 * @testedwith    WooCommerce 2.6.8, WordPress 4.7
 */
 
add_filter( 'woocommerce_checkout_coupon_message', 'bbloomer_have_coupon_message');
 
function bbloomer_have_coupon_message() {
return '<i class="fa fa-ticket" aria-hidden="true"></i> Have a coupon? <a href="#" class="showcoupon">Click here to enter your discount code</a>';
}