How do I know Bunker is secure and that my data is safe?

How do I connect to Bunker?

Will Bunker store my accounting system log-in information?

Will Bunker have access to my accounting system?

If I make changes in Bunker, such as to my Chart of Accounts mapping in Bunker, will those changes reflect in my accounting system?

Do I need to upload data into Bunker manually?

How does Bunker connect to my accounting system?

How do I know this API is secure?