We use a service called Plaid to sync transaction and account information from users’ financial institutions. Plaid handles all the authentication and Weekly only receives the financial information you choose to share. You can read all about Plaid security practices here: https://plaid.com/safety/
Since Plaid handles all the authentication, no login credentials are ever shared with Weekly. The only data we receive from Plaid is transaction and account data (like account names and balances). All data transferred from our servers to the Weekly app is encrypted over https connections.
Also, if you ever want to cancel, we can delete your data for you permanently — just send an email to support@weeklybudgeting.com.