SP500_URL - host of the SP500 dividend yield provider
SMPT_SENDER_USERNAME - username of the notification sender email account
SMPT_SENDER_PASSWORD - password of the notification sender email account
SMPT_SERVER_HOST - smtp server host
SMPT_SERVER_PORT - smpt server port
DB_CONNECTION_URI - database connection uri
STOCK_SCREENER_URL - stock-screener service url
USERPROFILE_URL - userprofile service url
PORT - service port to listen on
WATCHLIST_AUDIENCE - audience of the access_token
AUTHORIZATION_SERVER - authorization server url
WATCHLIST_SCOPE - required scope in the access_token