Invoke Invoicer

Invoke is an automatic invoicer designed for users who have regular recurring clients, for example therapists or private trainers. It reads from the user's Google Calendar and compares entries to the user's Google Sheet 'users' table to classify which calendar entries are user appointments. Running the program generates a PDF invoice for each client with appointment information based on how many times they showed up in the selected month (with reduced fees for cancelations), and uploads them to a folder in the users Google Drive.