Hi @Camilla.Evelyn  
Invoices are posted to two accounts: Sales and Receivables. 
There is a guide here that explains more about Mews invoicing:
Mews invoicing explained

Does that help?
Thanks

Hi @Sarah.Masterton-Brown 

Thank you, but i think the link is to something elles :)

We have disconnecetd the account Receivables, because it should go to our account system.

Is there an account where the invoices are “hanging” until they are marked as paid ?

Hi @Camilla.Evelyn, 

if your receivable tracking is disabled, you are not actually able to mark the invoices as paid in Mews. The invoice will just be marker as “closed” as soon as you issue it. The tracking as well as marking invoices as paid should be then managed from your connected accounting integration.

Therefore, they are actually not “hanging” anywhere. They are just issued and closed. 

Hope it helps :)