The package libbcel is an Emacs library to interact with Basecamp, a project management web application.
To make libbcel work, you first have to give it access to your Basecamp account. This is done through OAUTH2. If you already have a client id and secret, skip the next section. Otherwise, keep reading.
You'll be assigned a client id and client secret. Save that somewhere so you can skip this step next time.
You have a client id, client secret and port number for the redirect URI (default is 9321).