stripe react native subscription creation-Error- This customer has no attached payment source or default payment method

I am trying to create a subscription paymentsheet in react native, below is my code for backend. When I uncomment trial_period_days: 3, then it works even if payment methods are not declared. But if I comment this line, then I am getting error - "StripeInvalidRequestError: This customer has no attached payment source or default payment method. Please consider adding a default payment method." I tried below code to declare payment methods, but it did not work. I want new customers to also be able to use all the available payment methods that their country and OS platform supports.

const stripe = require('stripe')(stripeSecretKey);
const express = require('express');
const bodyParser = require('body-parser');
const app = express();
app.use(bodyParser.json());
app.get('/', (req, res) => {
res.send('Test');
});
app.post('/payment-sheet-subscription', async (req, res) => {
const {email = `test${Math.floor(Math.random() * 9999) + 1}@domain.com`} =
req.body;
const customer = await stripe.customers.create({email});
const ephemeralKey = await stripe.ephemeralKeys.create(
{customer: customer.id},
{apiVersion: '2020-08-27'},
);
const PRICE_ID = 'price_1NQ4EnSBro6pGrG8ZYfdBX5x';
const subscription = await stripe.subscriptions.create({
customer: customer.id,
items: [{price: PRICE_ID}],
// trial_period_days: 3,
});
const updatedSubscription = await stripe.subscriptions.update(
subscription.id,
{
payment_settings: {
payment_method_types: ['card'],
},
},
);
if (typeof updatedSubscription.pending_setup_intent === 'string') {
const setupIntent = await stripe.setupIntents.retrieve(
updatedSubscription.pending_setup_intent,
);
// if (typeof subscription.pending_setup_intent === 'string') {
//   const setupIntent = await stripe.setupIntents.retrieve(
//     subscription.pending_setup_intent,
//   );
return res.json({
setupIntent: setupIntent.client_secret,
ephemeralKey: ephemeralKey.secret,
customer: customer.id,
});
} else {
throw new Error(
'Expected response type string, but received: ' +
typeof subscription.pending_setup_intent,
);
}
});

The pending_setup_intent is only applicable for non-payment scenarios, such as trials.

When creating a subscription that does require payment before you have a payment method set up for the customer, you'll want to use payment_behavior='default_incomplete', as shown in Stripe's docs here. With this, you can expand the latest_invoice.payment_intent to get a client_secret to use in your front end app to complete the first payment. This is also shown in the docs here.