Never miss a dispute deadline

import time
from datetime import datetime, timezone
import stripe
from clickruntime import on_event, on_trigger, credentials, notify, verify, state

@on_event
def handle(event):
    if not verify.stripe(event.body, event.header("Stripe-Signature"), credentials.secret("STRIPE_WEBHOOK_SECRET")):
        return {"ignored": "bad signature"}
    d = event.json["data"]["object"]
    if event.json["type"] != "charge.dispute.created":
        return {"ignored": event.json["type"]}
    due = d["evidence_details"]["due_by"]
    notify.slack(f":rotating_light: Dispute opened: {d['amount'] / 100:,.2f} {d['currency'].upper()} · {d['reason']} · "
                 f"evidence due {datetime.fromtimestamp(due, timezone.utc):%b %d}", channel="#billing")
    return {"dispute": d["id"]}

@on_trigger
def daily_check(event):
    stripe.api_key = credentials.secret("STRIPE_API_KEY")
    reminded = set(state.get("reminded") or [])
    soon = [d for d in stripe.Dispute.list(limit=100).auto_paging_iter()
            if d.status in ("needs_response", "warning_needs_response") and d.id not in reminded
            and d.evidence_details.due_by - time.time() < 3 * 86400]
    for d in soon:
        notify.slack(f"Reminder: dispute {d.id} ({d.amount / 100:,.2f} {d.currency.upper()}) evidence due "
                     f"{datetime.fromtimestamp(d.evidence_details.due_by, timezone.utc):%b %d}", channel="#billing")
    state.set("reminded", sorted(reminded | {d.id for d in soon}))
    return {"reminders": len(soon)}