Developer hooks

Add these to your theme's functions.php or a small plugin.

Filters

Filter	Arguments	Use
wcbs_should_split_order	bool $split, int $order_id, WC_Order $order	Return false to skip an order
wcbs_backorder_items	array $items, int $order_id, WC_Order $order	Change which items and quantities move
wcbs_backorder_status	string $status, int $order_id, WC_Order $order	The new order's status (default backordered)
wcbs_copy_charges_to_backorder	bool $copy, WC_Order $order, WC_Order $backorder	Return true to copy shipping costs, fees and coupons in full (the behaviour before 2.4.0)
wcbs_meta_fields_to_copy	array $keys	Order meta keys copied to the backorder order
wcbs_disable_emails_on_split	bool $disable, WC_Order $order	Return false to let WooCommerce send emails during the split

Actions

Action	Arguments	When
wcbs_before_split_order	int $order_id, WC_Order $order	Before the split
wcbs_backorder_created	int $backorder_id, int $order_id, WC_Order $backorder, WC_Order $order	After the backorder order is saved
wcbs_after_split_order	int $order_id, WC_Order $order	After the split
wcbs_split_order_error	int $order_id, string $message	When a split fails

Examples

Only split orders paid by card:

add_filter( 'wcbs_should_split_order', function ( $split, $order_id, $order ) {
	return $split && 'cod' !== $order->get_payment_method();
}, 10, 3 );

Give backorder orders the On hold status:

add_filter( 'wcbs_backorder_status', function () {
	return 'on-hold';
} );

Charge shipping on both orders, as before 2.4.0:

add_filter( 'wcbs_copy_charges_to_backorder', '__return_true' );