OGGTA-Extra-Shift is really just a python script for finding extra shifts available on OGGTA.
Use the package manager pip to install OGGTA-Extra-Shift -- or you probably can just download it lol.
pip install git+https://github.com/SyouTono242/oggta-extra-shift.git
url: <url>
username: <oggta-username>
password: <oggta-password>
sender_email: <sender-email-address>
sender_password: <sender-email-password>
receiver_email: <receiver-email-address>