fun confirmTwintPayment() {
  val paymentLauncher = PaymentLauncher.create(
    fragment = this,
    publishableKey = publishableKey // Switzerland Stripe Key,
    callback = { /* handle payment result */ }
  )

  val paymentIntentParams = ConfirmPaymentIntentParams.create(
    clientSecret = clientSecret, // Provided by the backend
    paymentMethodType = PaymentMethod.Type.Twint,
  )

  // callback returns `PaymentResult.Failed`
  paymentLauncher.confirm(paymentIntentParams)
}

StripeError(
    type = "invalid_request_error", 
    message = "You cannot confirm this PaymentIntent because it's missing a payment method. You can either update the PaymentIntent with a payment method and then confirm it again, or confirm it again directly with a payment method or ConfirmationToken.", 
    code = "payment_intent_unexpected_state", 
    param = null, 
    declineCode = null, 
    charge = null, 
    docUrl = "https://stripe.com/docs/error-codes/payment-intent-unexpected-state", 
    extraFields = null
)

fun confirmTwintPayment() {
  val paymentLauncher = PaymentLauncher.create(
    fragment = this,
    publishableKey = publishableKey // Switzerland Stripe Key,
    callback = { /* handle payment result */ }
  )

  val twintParams = PaymentMethodCreateParams.createTwint()

  val paymentIntentParams = ConfirmPaymentIntentParams.createWithPaymentMethodCreateParams(
      paymentMethodCreateParams = twintParams,
      clientSecret = clientSecret, // Provided by the backend
  )

  // confirmation UX open and callback returns `PaymentResult.Success` when approved
  paymentLauncher.confirm(paymentIntentParams)
}