Manage gtoken access

const baseUrl = 'https://sandbox.groundtech.co';
const gVaultId = 'ground-ustb-vault';
const customerAddress = '0x2222222222222222222222222222222222222222';
const path = `/v2/gvaults/${gVaultId}/allowlist/${customerAddress}`;
const headers = { Authorization: `Bearer ${process.env.GROUND_API_KEY}` };
const response = await fetch(`${baseUrl}${path}/authorization`, { headers });
if (!response.ok) throw new Error(`Authorization request failed: ${response.status}`);
const authorization = await response.json();

const { typedData, issuedAt, expiresAt } = authorization;
const signature = await signer._signTypedData(
  typedData.domain, typedData.types, typedData.value,
);
const ownershipProof = { issuedAt, expiresAt, signature };

function isValidSignature(bytes32 hash, bytes calldata signature)
    external view returns (bytes4);

const result = await fetch(`${baseUrl}${path}`, {
  method: 'PUT',
  headers: {
    ...headers,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ ownershipProof }),
});
if (![200, 202].includes(result.status)) {
  throw new Error(`Allowlist request failed: ${result.status}`);
}

const response = await fetch(`${baseUrl}${path}`, { headers });
if (!response.ok) throw new Error(`Allowlist read failed: ${response.status}`);
const state = await response.json();

{
  "allowed": true,
  "status": "confirmed",
  "canManage": true
}

const response = await fetch(`${baseUrl}${path}`, { method: 'DELETE', headers });
if (![200, 202].includes(response.status)) {
  throw new Error(`Removal request failed: ${response.status}`);
}