public static function save( $post_id, $post ) {
		// Check for dupe coupons.
		$coupon_code  = wc_format_coupon_code( $post->post_title );
		$id_from_code = wc_get_coupon_id_by_code( $coupon_code, $post_id );

		if ( $id_from_code ) {
			WC_Admin_Meta_Boxes::add_error( __( 'Coupon code already exists - customers will use the latest coupon with this code.', 'woocommerce' ) );
		}

		$product_categories         = isset( $_POST['product_categories'] ) ? (array) $_POST['product_categories'] : array();
		$exclude_product_categories = isset( $_POST['exclude_product_categories'] ) ? (array) $_POST['exclude_product_categories'] : array();

		$coupon = new WC_Coupon( $post_id );
		$coupon->set_props(
			array(
				'code'                        => $post->post_title,
				'discount_type'               => wc_clean( $_POST['discount_type'] ),
				'amount'                      => wc_format_decimal( $_POST['coupon_amount'] ),
				'date_expires'                => wc_clean( $_POST['expiry_date'] ),
				'individual_use'              => isset( $_POST['individual_use'] ),
				'product_ids'                 => isset( $_POST['product_ids'] ) ? array_filter( array_map( 'intval', (array) $_POST['product_ids'] ) ) : array(),
				'excluded_product_ids'        => isset( $_POST['exclude_product_ids'] ) ? array_filter( array_map( 'intval', (array) $_POST['exclude_product_ids'] ) ) : array(),
				'usage_limit'                 => absint( $_POST['usage_limit'] ),
				'usage_limit_per_user'        => absint( $_POST['usage_limit_per_user'] ),
				'limit_usage_to_x_items'      => absint( $_POST['limit_usage_to_x_items'] ),
				'free_shipping'               => isset( $_POST['free_shipping'] ),
				'product_categories'          => array_filter( array_map( 'intval', $product_categories ) ),
				'excluded_product_categories' => array_filter( array_map( 'intval', $exclude_product_categories ) ),
				'exclude_sale_items'          => isset( $_POST['exclude_sale_items'] ),
				'minimum_amount'              => wc_format_decimal( $_POST['minimum_amount'] ),
				'maximum_amount'              => wc_format_decimal( $_POST['maximum_amount'] ),
				'email_restrictions'          => array_filter( array_map( 'trim', explode( ',', wc_clean( $_POST['customer_email'] ) ) ) ),
			)
		);
		$coupon->save();
		do_action( 'woocommerce_coupon_options_save', $post_id, $coupon );
	}