Faire des coupons Woocommerce auto-applicables

auto-apply-coupons.php

<?php

add_action( 'woocommerce_coupon_options', 'w_coupons_options', 10, 2 );
function w_coupons_options( $id, $coupon ) {
	woocommerce_wp_checkbox(
		array(
			'id'          => 'auto_applied',
			'label'       => __( 'Activé automatiquement', 'woocommerce' ),
			'description' => 'Cocher cette case pour ajouter automatiquement le coupon s’il est disponible pour le panier',
			'value'       => wc_bool_to_string( get_post_meta( $id, 'auto_applied', true ) ),
		)
	);
}

add_action( 'woocommerce_coupon_options_save', 'save_auto_apply_coupond_meta');
function save_auto_apply_coupond_meta( $post_id ) {
	$auto_applied = ! empty( $_POST['auto_applied'] ) ? 'yes' : 'no';
	update_post_meta( $post_id, 'auto_applied', $auto_applied );
}

add_action( 'template_redirect', 'need_auto_apply_coupons' );
function need_auto_apply_coupons() {
	if ( is_cart() || is_checkout() ) {
		auto_apply_coupons();
	}
}
function get_auto_appliable_coupons() {
$coupons = get_posts( array(
		'post_type'  => 'shop_coupon',
		'status'     => 'publish',
		'fields'     => 'ids',
		'meta_query' => array(
			array(
				array(
					'key'     => 'auto_applied',
					'value'   => 'yes',
				),
			),
			array(
				'relation'    => 'OR',
 				array(
					'key'     => 'date_expires',
					'value'   => NULL,
				),
				array(
					'key'     => 'date_expires',
					'value'   => strtotime( 'now' ),
					'compare' => '>',
				),
			),
		)
	) );
}
function auto_apply_coupons() {
	$coupons = get_auto_appliable_coupons();
	$cart = WC()->cart;
	foreach ( $coupons as $c ) {
		$coupon = new WC_Coupon( $c );
		$code = $coupon->get_code();
		if ( ! $cart->has_discount( $code ) ) {
			$WC_Discounts = new WC_Discounts( WC()->cart );
			if ( ! is_wp_error( $WC_Discounts->is_coupon_valid( $coupon ) ) ) {
				WC()->cart->apply_coupon( $code );
			}
		}
	}
	return false;
}

add_aciton( 'woocommerce_before_save_order_items', 'w_apply_coupon_on_save_order', 10, 2 );
function w_apply_coupon_on_save_order( $order_id, $items ) {
	$order = wc_get_order( $order_id );
	$order_coupons = $order->get_coupon_codes();
	$coupons = get_auto_appliable_coupons();
	foreach ( $coupons as $c ) {
		$coupon = new WC_Coupon( $c );
		$code = $coupon->get_code();
		if ( ! in_array( $code, $order_coupons ) ) {
			$WC_Discounts = new WC_Discounts( $order );
			if ( ! is_wp_error( $WC_Discounts->is_coupon_valid( $coupon ) ) ) {
				$order->apply_coupon( $code );
			}
		}
	}
}