Get a weekly list of overdue FreshBooks invoices

from datetime import date
from clickruntime import on_trigger, credentials, http, notify

FB = "https://api.freshbooks.com"

def fb():
    token = credentials.connection("freshbooks", "work")
    headers = {"Authorization": f"Bearer {token}"}
    me = http.get(f"{FB}/auth/api/v1/users/me", headers=headers).json()["response"]
    return headers, me["business_memberships"][0]["business"]["account_id"]

@on_trigger
def run(event):
    headers, account = fb()
    invoices = http.get(f"{FB}/accounting/account/{account}/invoices/invoices", headers=headers,
                        params={"search[v3_status]": "overdue", "per_page": 100}).json()["response"]["result"]["invoices"]
    lines, total = [], 0.0
    for inv in sorted(invoices, key=lambda i: i["due_date"]):
        owed = float(inv["outstanding"]["amount"])
        days = (date.today() - date.fromisoformat(inv["due_date"])).days
        lines.append(f"{inv['organization']} #{inv['invoice_number']}: {owed:,.2f}, {days} days overdue")
        total += owed
    notify.email_me(f"Overdue FreshBooks invoices: {total:,.2f}", "\n".join(lines) or "Nothing overdue.")
    return {"count": len(lines), "total": total}