Qiwi billing not working?

Question

API

Hello, when you click the button, you need to issue an invoice for Qiwi and redirect the person to the payment form. I get this error

Here is the code that I have
This is in the app.js server side

app.put('/create-payment', function () {
  p = JSON.parse(qiwi());
});


function qiwi() {

  const billId = qiwiApi.generateId();

  const fields = {
      amount: 1.00,
      currency: 'RUB',
      comment: 'test',
      expirationDateTime: '2018-03-02T08:44:07',
      successUrl: 'http://test.ru/'
  };

  qiwiApi.createBill( billId, fields ).then( data => {
      //do with data
  });
}

I still can’t figure out what to do with this createBill

This is a button click handler

document.querySelectorAll('.payments').forEach(function(element){
  element.onclick = createPayment;
});

function createPayment() {
  fetch('/create-payment',{
  method: 'PUT',
  headers: {
    'Authorization': 'Bearer %%%%%%%%%%2gCRwwF3Dnh5XrasNTx3BGPiMsyXQFNKQhvukniQG8RTVhYm3iPwPhF1aV7hgCHTZbGec4giFGqmsEEVhPUjQ53RCTCTPZZSiJjWpK2yxxfQtUV8gg124j6t5xuC21LcuAvM25dLFy1x2cPKbA4QYTdqUfzK',
    'Accept': 'application/json',
    'Content-Type' : 'application/json'
  }
}).then(function (response) {
      return response.text();
  }
  )
}

I can’t figure out what the error is and how to deal with this error
And I can’t figure out how to accept a json response with a link to the form itself

Answer 1

Now the code in the server-side after calling PUT /create-paymentcalls qiwi(), which returns nothing (returns undefined), and this is parsed into JSON.parse.
You probably want to parse the result of calling qiwiApi.createBill( billId, fields ). If so, then explore how to work with async functions and/or use Promises.
If you understand correctly what you wanted to do, then the server code will be like this:

app.put('/create-payment', async function (req,res,next) {
  const data = await qiwi(); // получаем в data результат вызова qiwiApi.createBill
  const p = JSON.parse(data);
  // тут делаем что-то еще, если нужно
  next(); // т.к. функция асинхронная, вызываем next, чтобы объявить о завершении выполнения этого middleware
});


async function qiwi() {
  const billId = qiwiApi.generateId();

  const fields = {
      amount: 1.00,
      currency: 'RUB',
      comment: 'test',
      expirationDateTime: '2018-03-02T08:44:07',
      successUrl: 'http://test.ru/'
  };

  const data = await qiwiApi.createBill( billId, fields );
  // тут делаем что-то еще, если нужно
  return data; // возвращаем результат вызова qiwiApi.createBill
}

Answer 2

You send a request to localhost:3000
That is, to yourself.
And you need to send it to the server of the payment system