Code snippet to hide applied coupons and inapplicable coupons from display - By WebToffee (Smart Coupon Basic)

functions.php

<?php>//Do not copy this line of code
add_filter( 'wt_smart_coupon_display_invalid_coupons', '__return_false' );

add_filter( 'wt_sc_alter_user_coupons', 'wbte_sc_remove_applied_coupons_from_user_coupons' );

if ( ! function_exists( 'wbte_sc_remove_applied_coupons_from_user_coupons' ) ) {
    /**
     * Remove applied coupons from user coupons list
     *
     * @param array $post_ids Array of coupon post IDs.
     * @return array Modified array of coupon post IDs.
     */
    function wbte_sc_remove_applied_coupons_from_user_coupons( $post_ids ) {
        if ( is_null( WC()->cart ) ) {
            return $post_ids;
        }

        $applied_coupon_ids = array_filter( array_map( 'wc_get_coupon_id_by_code', WC()->cart->get_applied_coupons() ) );

        return array_diff( $post_ids, $applied_coupon_ids );
    }
}