If a client has entered payment card info but there's this warning, the reason can be one of the following
- 3D Secure authorization missing (a second authorization after entering payment details)
- Bank has refused (negative balance on bank account etc)
- Other
If the client usually can pay and there one unpaid invoice, then we will suggest opening the invoice and resending this, so the customer can pay manually.
If it is a new client or an issue that keeps happening on multiple invoices, then we would suggest asking the client to contact the bank.