Default bank account with API

Hi all, We are now using the API to generate our invoices and have found a potential feature/glitch.

When sending an invoice from our software to Clearbooks, it appears that there is no way to way "use the default bank account for the client" - if you don't include the bank account to use, invoices are generated with no payment details on them - obviously less than ideal.

Am I missing a trick here, or is this an omission in the design? I can't see anything in the docs. Ideally, I'd rather not expose any more permissions to our guarding app than is absolutely necessary.