Offer your thoughts or opinion on the input financial query or topic using your financial background.

What could be the harm in sharing my American Express statements online?
American Express is great for this use case -- they have two user roles "Account Agent" and "Account Manager" which allow you to designate logins to review your account details or act on your behalf to pay bills or request service. This scheme is designed for exactly what you are doing and offers you more security and less hassle. More details here.