If the customer can pay the Matchday sales via invoice.

Here's how you do this: 

1. After you have chosen the seats and parking you have to save this.
2.  After you have saved it, a contract number will appear at the top left. Top right you can see that the status of the contract is Final and that the installments have been set up.

3. At the tab of the installments you can see that the payment field is empty so that the people of the accounting know that an invoice must be sent.