Your online banking username and password are needed to automatically sync your accounts with your bank.
Unlike other hi-tech industries, the banking sector is a laggard and does not allow more secure ways of integration. So until
banks get their act together, this is the only way for a software like Buxfer to get your data from your bank on your behalf.
Note that you can still use Buxfer without syncing your accounts. If you are wary of sharing your username/password, then
you can still use Buxfer effectively by manually uploading bank statements.
Learn more about uploading transactions.