curl -X POST https://console.trychert.com/api/v1/chats/ch_01H.../leave \
  -H "x-chert-tenant: $TENANT" \
  -H "x-chert-signature: v1,$TS,$SIG"

const ts = Math.floor(Date.now() / 1000)
const body = ""
const sig = crypto.createHmac("sha256", SIGNING_SECRET).update(`${ts}.${body}`).digest("hex")
const res = await fetch(`https://console.trychert.com/api/v1/chats/${chatId}/leave`, {
  method: "POST",
  headers: {
    "x-chert-tenant": TENANT_SLUG,
    "x-chert-signature": `v1,${ts},${sig}`,
  },
})

import hmac, hashlib, time, requests
ts = int(time.time())
body = ""
sig = hmac.new(SIGNING_SECRET.encode(), f"{ts}.{body}".encode(), hashlib.sha256).hexdigest()
r = requests.post(
    f"https://console.trychert.com/api/v1/chats/{chat_id}/leave",
    headers={
        "x-chert-tenant": TENANT_SLUG,
        "x-chert-signature": f"v1,{ts},{sig}",
    },
)

{
  "chat_id": "ch_01H...",
  "status": "left"
}