ClickFunnels Orders::Invoice API
> Invoices track payments for orders. Order Invoices are the invoices issued against Orders. For more information please consult our [Orders Overview guide](https://developers.myclickfunnels.com/docs/orders). Orders can be fulfilled by fulfilling invoice line items. Please refer to [our Fulfillments guide](https://developers.myclickfunnels.com/docs/fulfillments) to see how this can be done.