How to sync so that my data is updated regularly

i have already linked my account thru API and it had updated - however some new transactions do not seem to be updating into accointing.

how do i sync to accointing?

After you login, refresh your wallets. Sometimes in the top right, the system will suggest a refresh of all of them, you can click that to refresh all of them at the same time, otherwise go through and manually refresh all of them.