Error completeCheckoutSession

[ducgeniee]

This is my code:

const fs = require('fs');
const uuidv4 = require('uuid/v4');
const Client = require('@amazonpay/amazon-pay-api-sdk-nodejs');

const config = {
    publicKeyId: ‘xxxxxxx’,
    privateKey: fs.readFileSync('./keys/AmazonPay_xxxxx.pem'),
    region: 'jp',
    sandbox: true
};

const payload = {
    chargeAmount: {
        amount: 50,
        currencyCode: 'JPY'
    }
};

const checkoutSessionId = ‘xxxxxx’;

const testPayClient = new Client.WebStoreClient(config);
testPayClient.completeCheckoutSession(checkoutSessionId, payload).then((apiResponse: any) => {
    const response = apiResponse;
    console.log(response['data']);
});

This is error:

/Users/ducbui/src/amazonPayment/test/node_modules/axios/lib/core/createError.js:16
  var error = new Error(message);
              ^
Error: Request failed with status code 422
    at createError (/Users/ducbui/src/amazonPayment/test/node_modules/axios/lib/core/createError.js:16:15)
    at settle (/Users/ducbui/src/amazonPayment/test/node_modules/axios/lib/core/settle.js:17:12)
    at IncomingMessage.handleStreamEnd (/Users/ducbui/src/amazonPayment/test/node_modules/axios/lib/adapters/http.js:269:11)
    at IncomingMessage.emit (node:events:538:35)
    at IncomingMessage.emit (node:domain:475:12)
    at endReadableNT (node:internal/streams/readable:1345:12)
    at processTicksAndRejections (node:internal/process/task_queues:83:21) {
......
data: {
      reasonCode: 'InvalidCheckoutSessionStatus',
      message: 'You tried to call an operation on a Checkout Session that is in a state where that operation is not allowed'
    }

Anyone have any ideas to fix this error?