Automattic\WooCommerce\Admin\API\Reports\Coupons

DataStore::get_coupon_id() │ public static │ WC 1.0

Get coupon ID for an order.

Tries to get the ID from order item meta, then falls back to a query of published coupons.

Method of the class: DataStore{}

No Hooks.

Return

Int. Coupon ID on success, 0 on failure.

Usage

$result = DataStore::get_coupon_id( $coupon_item );
$coupon_item(\WC_Order_Item_Coupon) (required)
The coupon order item object.

DataStore::get_coupon_id() code WC 8.7.0

woocommerce/src/Admin/API/Reports/Coupons/DataStore.php 
public static function get_coupon_id( \WC_Order_Item_Coupon $coupon_item ) {
	// First attempt to get coupon ID from order item data.
	$coupon_info = $coupon_item->get_meta( 'coupon_info', true );
	if ( $coupon_info ) {
		return json_decode( $coupon_info, true )[0];
	}

	$coupon_data = $coupon_item->get_meta( 'coupon_data', true );

	// Normal checkout orders should have this data.
	// See: https://github.com/woocommerce/woocommerce/blob/3dc7df7af9f7ca0c0aa34ede74493e856f276abe/includes/abstracts/abstract-wc-order.php#L1206.
	if ( isset( $coupon_data['id'] ) ) {
		return $coupon_data['id'];
	}

	// Try to get the coupon ID using the code.
	return wc_get_coupon_id_by_code( $coupon_item->get_code() );
}