Invoice integration via Gothia API can be of different complexity depending on what functionality you would like to utilize. In this example you can see the simplest way of integrating invoice functionality from your web shop to Gothia. At the checkout - order confirmation - two requests are made to Gothia, one that creates the customer and one that places the reservation of the order amount. Since the reservation of the order is done on amount level you can change the order lines as you wish, and at order delivery you send another request or text file to Gothia to create the invoice with the invoice's details. Please see the sub-pages for each country's characteristics.