You need to create .env file at the root
# Garmin API Keys
CONSUMER_KEY=YOUR_CONSUMER_KEY
CONSUMER_SECRET=YOUR_CONSUMER_SECRET
# Flask Secret key
FLASK_SECRET_KEY=RANDOMLY_SMASHING_ON_YOUR_KEYBOARD
# optional: store the data to mongodb
MONGO_CONNECTION_STRING=STORE_THE_DATA_TO_MONGODB_IF_YOU_WISH