## Confirm a Klarna setup

Use `stripe.confirmKlarnaSetup` in the [Klarna Payments with Setup Intents](/payments/klarna/set-up-payment.md) flow when the customer submits your setup form.
When called, it will confirm the `SetupIntent` with `data` you provide, and it will automatically redirect the customer to authorize the setup.
Once authorization is complete, the customer will be redirected back to your specified `return_url`.

> Note that `stripe.confirmKlarnaSetup` may take several seconds to complete.
> During that time, you should disable your form from being resubmitted and show a waiting indicator like a spinner.
> If you receive an error result, you should be sure to show that error to the customer, re-enable the form, and hide the waiting indicator.

`stripe.confirmKlarnaSetup` will trigger a redirect when successful.
If there is an error, it will return a `Promise` which resolves with a `result` object.
This object has either:
* `result.setupIntent`: the successful [SetupIntent](/api/setup_intents).
* `result.error`: an error.
  Refer to the [API reference](/api/errors) for all possible errors.

**Syntax:** `stripe.confirmKlarnaSetup(...)`

- `clientSecret` (string) **required**
  The [client secret](/api/setup_intents/object.md#setup_intent_object-client_secret) of the `SetupIntent`.

- `data` (object)
  Data to be sent with the request.
Refer to the [Setup Intents API](/api/setup_intents/confirm.md) for a full list of parameters.

  - `payment_method` (string | object)
    The `id` of an existing [PaymentMethod](/api/payment_methods.md).
See the use case sections below for details.

  - `return_url` (string) **required**
    The url your customer will be directed to after they complete authentication.

### Use case: with an existing payment method

Use `stripe.confirmKlarnaSetup` with an existing `PaymentMethod` by passing its `id` to `payment_method`.
The `PaymentMethod` will be used to confirm the `SetupIntent`.

### Data argument properties

- `payment_method` (string) **required**
  The `id` of an existing `PaymentMethod`.

- `return_url` (string) **required**
  The url your customer will be directed to after they complete authentication.

### Confirm with existing payment method

```js
stripe
  .confirmKlarnaSetup('{PAYMENT_INTENT_CLIENT_SECRET}', {
    payment_method: '{PAYMENT_METHOD_ID}',
    // Return URL where the customer should be redirected after the authorization.
    return_url: "https://example.com/setup/complete",
  })
  .then(function(result) {
    if (result.error) {
      // Inform the customer that there was an error.
    }
  });
```

```es_next
const {error} = await stripe.confirmKlarnaSetup(
  '{PAYMENT_INTENT_CLIENT_SECRET}',
  {
    payment_method: '{PAYMENT_METHOD_ID}',
    // Return URL where the customer should be redirected after the authorization.
    return_url: "https://example.com/setup/complete",
  },
);
```

### Use case: with an attached PaymentMethod

If you have already attached a `PaymentMethod` to this `SetupIntent`, then you can confirm the `SetupIntent` using `stripe.confirmKlarnaSetup` without passing in any additional data.

### Confirm with an attached PaymentMethod

```js
stripe
  .confirmKlarnaSetup('{SETUP_INTENT_CLIENT_SECRET}', {
    // Return URL where the customer should be redirected after
    // the authorization.
    return_url: "https://example.com/setup/complete",
  })
  .then(function(result) {
    if (result.error) {
      // Inform the customer that there was an error.
    }
  });
```

```es_next
const {setupIntent, error} = await stripe.confirmKlarnaSetup(
  '{SETUP_INTENT_CLIENT_SECRET}',
  {
    // Return URL where the customer should be redirected after
    // the authorization.
    return_url: "https://example.com/setup/complete",
  },
);
```

### Use case: with self collected data

Your customer's email and billing country are required for the Klarna authorization to succeed.
You can pass in these properties directly to create a new `PaymentMethod` and confirm the `SetupIntent`.

### Data argument properties

- `payment_method` (object) **required**
  Pass an object to confirm with the customer's email and billing country.

  - `billing_details` (object) **required**
    The customer's [billing_details](/api/payment_methods/create.md#create_payment_method-billing_details).
`email` and `address.country` are required.

    - `email` (string) **required**
      The customer's email.

    - `address` (object) **required**
      The customer's billing address.

      - `country` (string) **required**
        The customer's billing country.

- `return_url` (string) **required**
  The url your customer will be directed to after they complete authentication.

### Confirm with self collected data

```js
stripe
  .confirmKlarnaSetup('{SETUP_INTENT_CLIENT_SECRET}', {
    payment_method: {
      billing_details: {
        email: 'jenny@example.com',
        address: {
          country: 'DE',
        },
      },
    },
    // Return URL where the customer should be redirected after
    // the authorization.
    return_url: "https://example.com/setup/complete",
  })
  .then(function(result) {
    if (result.error) {
      // Inform the customer that there was an error.
    }
  });
```

```es_next
const {error} = await stripe.confirmKlarnaSetup(
  '{SETUP_INTENT_CLIENT_SECRET}',
  {
    // Return URL where the customer should be redirected after
    // the authorization.
    return_url: "https://example.com/setup/complete",
  },
);
```

### Confirm a Klarna setup

```js
stripe
  .confirmKlarnaSetup('{SETUP_INTENT_CLIENT_SECRET}', {
    payment_method: {
      billing_details: {
        email: 'jenny@example.com',
        address: {
          country: 'DE',
        },
      },
    },
    // Return URL where the customer should be redirected after
    // the authorization.
    return_url: "https://example.com/setup/complete",
  })
  .then(function(result) {
    if (result.error) {
      // Inform the customer that there was an error.
    }
  });
```

```es_next
const {error} = await stripe.confirmKlarnaSetup(
  '{SETUP_INTENT_CLIENT_SECRET}',
  {
    // Return URL where the customer should be redirected after
    // the authorization.
    return_url: "https://example.com/setup/complete",
  },
);
```