Currently all the treaties and trades have a fixed monetary value attached to them - but there's no way to simply click one button to pay the current 'balance'. Instead you have to use the Gildar adjustment buttons/text field to fill in the value for every transaction (and there's no way to do more than one treaty at a time).
Seems like pointless busywork when it could be set to simply fill the trade with whatever your Gildar deficit is for the current transaction.