createSpendPermission

const result = await createSpendPermission({
  network: "base-sepolia",
  spender: "0x5678...",
  token: "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE", // ETH
  allowance: "1000000000000000000", // 1 ETH in wei
  period: 86400, // 24 hours
  start: Math.floor(Date.now() / 1000),
  end: Math.floor(Date.now() / 1000) + 86400 * 30, // 30 days from now
  useCdpPaymaster: true
});