Approving transfers without gas

PENDING ──submit──▶ SUBMITTED ──on-chain confirmed──▶ CONFIRMED
   │                    │
   └────────── FAILED ◀─┘

                 ┌── all permits CONFIRMED ─────────────────────┐
PENDING ─────────┤                                              ├──▶ ACTIVE
                 └── VERIFYING_ALLOWANCE ── all assets covered ─┘
                            │
                            └── window expires ──▶ PENDING

import { ethers } from "ethers";

// `typedData` is result[].typedData from GET .../permits
const { domain, types, message } = typedData;

// ethers builds the domain separator itself, so remove EIP712Domain before signing
const { EIP712Domain, ...signTypes } = types;

const wallet = new ethers.Wallet(PRIVATE_KEY); // MUST be the wallet `owner` key
const signature = await wallet.signTypedData(domain, signTypes, message);

const { v, r, s } = ethers.Signature.from(signature); // submit these below

curl --request POST \
  --url https://api.venlyfinance.com/v1/accounts/{accountId}/wallets/{walletId}/permits \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
    "supportedAssetId": "7c32877a-cd0c-422a-a0fd-5af0815fc280",
    "signature": { "v": "27", "r": "0x...", "s": "0x..." }
  }'

curl https://api.venlyfinance.com/v1/accounts/{accountId}/wallets/{walletId}/allowances \
  -H "Authorization: Bearer <token>"