Recover abandoned carts on WhatsApp

import time
from clickruntime import on_event, on_trigger, credentials, http, notify, state

WA = "https://graph.facebook.com/v20.0/your-phone-number-id/messages"

def wa_template(to, name, params):
    body = {"messaging_product": "whatsapp", "to": to, "type": "template", "template": {"name": name, "language": {"code": "en"},
            "components": [{"type": "body", "parameters": [{"type": "text", "text": str(p)} for p in params]}]}}
    return http.post(WA, headers={"Authorization": f"Bearer {credentials.secret('WHATSAPP_TOKEN')}"}, json=body).json()

@on_event
def handle(event):
    c = event.json or {}
    carts = state.get("carts") or {}
    if c.get("status") == "paid":
        carts.pop(c.get("id"), None)
    elif c.get("phone") and c.get("opt_in"):
        carts[c["id"]] = {"phone": c["phone"], "name": c.get("name", "there"), "total": c.get("total"), "at": time.time()}
    state.set("carts", carts)
    return {"open": len(carts)}

@on_trigger
def run(event):
    carts = state.get("carts") or {}
    due = {k: v for k, v in carts.items() if time.time() - v["at"] > 3600}
    for cid, c in due.items():
        wa_template(c["phone"], "cart_reminder", [c["name"]])
        notify.slack(f":shopping_trolley: Cart reminder sent to {c['name']} ({c['total']})", channel="#sales")
        carts.pop(cid)
    state.set("carts", carts)
    return {"reminded": len(due)}