For every order, there should be a payment corresponding to the total amount of the order. Most commonly, an order will be sent to Omnium after the order has been placed from an e-commerce site. That means that the payment should already be authenticated in the payment provider (such as Klarna, Paypal or Vipps). Omnium will then be able to void, capture or credit the payment later on in the order process.
Payment details can be located within the payment tab for each order. A successful order, both the reserved amount and the capture amount will have a status of "processed. If the payment can't be captured, it will have a status of "failed.
If additional product is added to the order after a reservation has been made, a new manual payment needs to be added.