**Last updated**: 24 June 2025 | [**Change log**](/products/checkout/web/changelog/)

# Create `sessionState`

Create a `sessionState` by sending your customer's card details.

### `sessionState`

A `sessionState` is a unique identifier for your customer's card details, which is generated by the SDK.

### Using the `sessionState`

Once you've received the `sessionState`, use the `sessionState` to generate a [verified token](/products/verified-tokens/create-verified-token#create-a-verified-token-request) to [take a payment](/products/card-payments/v6/authorize-a-payment#-migratecardonfile-authorization).

## Getting the `sessionState`

### Submitting the form

To create a `sessionState` you need to submit your customer's card details.

Here's an example of what you must do to generate a `sessionState`.

### JavaScript

#### Prevent default submit


```
  function (error, checkout) {
    if (error) {
      console.error(error);
      return;
    }

    form.addEventListener("submit", function (event) {
      event.preventDefault();

      checkout.generateSessionState(function (error, sessionState) {
        if (error) {
          console.error(error);
          return;
        }
            
        // session state for card details
        alert(sessionState);
      });
    });
   }
```

#### Event listener

The `form.addEventListener("wp:field:change", function (event)...` function waits for your customer to click the submit button.

The `event.preventDefault()` stops the form from being submitted. Invoking this action is **optional**.

#### Generate `sessionState`

To generate a `sessionState` you **must** invoke the `checkout.generateSessionState` method.

### Create a Verified token

Once you've received a `sessionState` you must create a [verified token](/products/verified-tokens/create-verified-token#create-a-verified-token-request) to [take a payment](/products/card-payments/v6/authorize-a-payment#-migratecardonfile-authorization).

**Next steps**

[Verified token](/products/verified-tokens/create-verified-token)