Authentication in Flask app using flask-simpleldap
I wrote flask-simpleldap and just found this, I hope this will be useful for someone. LDAP_USERNAME and LDAP_PASSWORD are the credentials you use to bind to a directory server. It's usually a service account and it's the account that will be used to run queries against the directory server, e.g. search for users/groups, bind a user account etc.
There are some example apps in the github repo that should help you understand a bit better.