Can API be used to tell if/when a VAT return has been submitted via FreeAgent?

An accounting client uses our Senta CRM to manage their workflows, including VAT submissions on behalf of their client.

Currently they submit the VAT via FreeAgent, then tick off the task as “Done” in Senta. We’d like to automate this last step if possible.

I’ve had a look through the API docs on but can’t see anything which would do this…?

Thanks in advance.