Finished with a very simple implementation

panera_shifts_gcal_backend/__init__.py

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+import pytz
+import calendar as cal_module
+import datetime
+from panera_shifts_gcal_backend.shifts import Shift
+from panera_shifts_gcal_backend.config import config
+from gapi.apis.calendar_api.models import Calendar
+from gapi.apis.calendar_api.calendar_api import calendar_api
+from panera_shifts import login, get_shifts_between
+
+
+def init_calendar():
+    api = calendar_api("Panera shift sync")
+    calendar = Calendar(api, config["calendar"]["calendar_name"].lower())
+    return calendar
+
+
+def input_all_shifts_for_month():
+    # get latest inputted date; only show shifts past that date
+    calendar = init_calendar()
+    today = datetime.date.today()
+    max_day = cal_module.monthrange(today.year, today.month)
+    start = datetime.date(today.year, today.month, 1)
+    end = datetime.date(today.year, today.month, max_day[1])
+    read_from = datetime.date(start.year, start.month, start.day)
+    start_dt = datetime.datetime.combine(
+        start, datetime.time(0, 0, 0, 0), datetime.timezone.utc
+    )
+    end_dt = datetime.datetime.combine(
+        end + datetime.timedelta(days=1),
+        datetime.time(0, 0, 0, 0),
+        datetime.timezone.utc,
+    )
+    for event in calendar.get_events(start_dt, end_dt):
+        if event.end > read_from:
+            read_from = event.end
+    panera_session = login(
+        config["credentials"]["username"], config["credentials"]["password"]
+    )
+    shifts_info = get_shifts_between(
+        panera_session,
+        datetime.date(read_from.year, read_from.month, read_from.day),
+        end,
+    )
+    timezone = shifts_info["data"]["timezone"]
+    cafe_info = shifts_info["data"]["currentShifts"]["cafe"][0]
+    for shift in shifts_info["data"]["currentShifts"]["shifts"]:
+        s = Shift.from_dict(shift, cafe_info, timezone)
+        e = s.to_Event()
+        calendar.update_or_add_event(e)
+
+
+if __name__ == "__main__":
+    input_all_shifts_for_month()

panera_shifts_gcal_backend/config.py

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+import appdirs
+import os
+import toml
+from pathlib import Path
+
+my_appdirs = appdirs.AppDirs("panera_shifts_gcal")
+os.makedirs(my_appdirs.user_config_dir, exist_ok=True)
+config_file = Path(my_appdirs.user_config_dir) / "config.toml"
+with config_file.open() as config:
+    config = toml.load(config)