Paymaster valid until after specified time

import { ethers } from 'ethers';
import { EtherspotBundler, PrimeSdk } from '../src';
import { printOp } from '../src/sdk/common/OperationUtils';
import * as dotenv from 'dotenv';
import { sleep } from '../src/sdk/common';

dotenv.config();

const recipient = '0x80a1874E1046B1cc5deFdf4D3153838B72fF94Ac'; // recipient wallet address
const value = '0.0001'; // transfer value
const bundlerApiKey = 'eyJvcmciOiI2NTIzZjY5MzUwOTBmNzAwMDFiYjJkZWIiLCJpZCI6IjMxMDZiOGY2NTRhZTRhZTM4MGVjYjJiN2Q2NDMzMjM4IiwiaCI6Im11cm11cjEyOCJ9';

const arka_api_key = 'arka_public_key'; // Only testnets are available, if you need further assistance in setting up a paymaster service for your dapp, please reach out to us on discord or https://etherspot.fyi/arka/intro
const arka_url = 'https://arka.etherspot.io';
const queryString = `?apiKey=${arka_api_key}&chainId=${Number(process.env.CHAIN_ID)}`;

async function main() {
    // initializing sdk...
    const primeSdk = new PrimeSdk({ privateKey: process.env.WALLET_PRIVATE_KEY }, {
        chainId: Number(process.env.CHAIN_ID), bundlerProvider: new EtherspotBundler(Number(process.env.CHAIN_ID), bundlerApiKey)
    })

    console.log('address: ', primeSdk.state.EOAAddress)

    // get address of EtherspotWallet...
    const address: string = await primeSdk.getCounterFactualAddress();
    console.log('\x1b[33m%s\x1b[0m', `EtherspotWallet address: ${address}`);

    // get balance of the account address
    let balance = await primeSdk.getNativeBalance();
    console.log('balances: ', balance);

    // clear the transaction batch
    await primeSdk.clearUserOpsFromBatch();

    // add transactions to the batch
    const transactionBatch = await primeSdk.addUserOpsToBatch({ to: recipient, value: ethers.utils.parseEther(value) });
    console.log('transactions: ', transactionBatch);

    // get balance of the account address
    balance = await primeSdk.getNativeBalance();

    console.log('balances: ', balance);

    /* estimate transactions added to the batch and get the fee data for the UserOp
        validUntil and validAfter are optional defaults to 10 mins of expiry from send call and should be passed in terms of milliseconds
        For example purpose, the valid is fixed as expiring in 100 mins once the paymaster data is generated
        validUntil and validAfter is relevant only with sponsor transactions and not for token paymasters
    */
    const op = await primeSdk.estimate({
        paymasterDetails: { url: `${arka_url}${queryString}`, context: { mode: 'sponsor', validAfter: new Date().valueOf(), validUntil: new Date().valueOf() + 6000000 } }
    });
    console.log(`Estimate UserOp: ${await printOp(op)}`);

    // sign the UserOp and sending to the bundler...
    const uoHash = await primeSdk.send(op);
    console.log(`UserOpHash: ${uoHash}`);

    // get transaction hash...
    console.log('Waiting for transaction...');
    let userOpsReceipt = null;
    const timeout = Date.now() + 60000; // 1 minute timeout
    while ((userOpsReceipt == null) && (Date.now() < timeout)) {
        await sleep(2);
        userOpsReceipt = await primeSdk.getUserOpReceipt(uoHash);
    }
    console.log('\x1b[33m%s\x1b[0m', `Transaction Receipt: `, userOpsReceipt);
}

main()
    .catch(console.error)
    .finally(() => process.exit());