In CONSIGNOR's production there is a group called Payer - here you can check Third party pays, when Third party pays is checked a contact list will open.
This is a Payer specific contact list - here you can double click on saved contacts to load them as the third party payer for the shipment.
If you don't have any contacts saved in this list, you can right click and select New Contact..
If it is not possible to select Receiver pays or Third party pays then the carrier is not supporting this service - register a request in the customer center if the carrier states otherwise.
Enter the payers contact information here and push OK.
When the contact is saved you can add the contacts customer number with the carrier - right click on the contact and choose edit.
Navigate to the accounts tab, choose add.
Enter the Carrier, Subcarrier, Kind and value.
Kind should be Account Number if you are adding the contacts customer number with the carrier.
NB: Some carriers also might require Agent Number filled out - this can be added the same way as Account Number - just choose Agent Number on Kind.
When the contact is saved, you can just double click on the contact and it will be added to the shipment as a third party payer.
This list can now be found under Contact List - Payer, here you can add or edit existing contacts.
See also How to use receiver pays in CONSIGNOR