ACFW – Invalidate coupons for products with certain custom meta data

  add_filter( 'woocommerce_coupon_is_valid', function( $valid, $coupon, $discount ) {

      $excluded_channels = $coupon->get_meta( '_excluded_og_channels', true );

      if ( empty( $excluded_channels ) ) {

          return $valid;

      }

      // Handle both a single stored string and a serialized array

      if ( ! is_array( $excluded_channels ) ) {

          $excluded_channels = array( $excluded_channels );

      }

      foreach ( WC()->cart->get_cart() as $cart_item ) {

          $product_id = ! empty( $cart_item['variation_id'] ) ? $cart_item['variation_id'] : $cart_item['product_id'];

          $og_channel = get_post_meta( $product_id, 'og_channel', true );

          if ( empty( $og_channel ) && ! empty( $cart_item['variation_id'] ) ) {

              $og_channel = get_post_meta( $cart_item['product_id'], 'og_channel', true );

          }

          if ( $og_channel && in_array( $og_channel, $excluded_channels, true ) ) {

              throw new Exception(

                  __( 'Sorry, this coupon is not valid for one or more products in your cart.', 'woocommerce' )

              );

          }

      }

      return $valid;

  }, 10, 3 );