> For the complete documentation index, see [llms.txt](https://developer.esw.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.esw.com/light-touch-integration/features/checkout/technical-details.md).

# Technical Details

This page covers the technical details for the `ESW_LTI` browser cookie used by [Checkout](/light-touch-integration/features/checkout.md).

### What the `ESW_LTI` cookie does

The LTI script creates and manages the `ESW_LTI` cookie in the browser.

ESW configures that script as part of the LTI setup. ESW also controls values such as `PricingSyncId` and `IsEswCountry`.

This cookie stores the country, currency, and pricing context that LTI uses on the storefront and during checkout handoff.

### Cookie fields

#### `CountryIso`

The shopper delivery country.

Use a 2-letter ISO 3166 country code, such as `IE`, `US`, or `GB`.

#### `CurrencyIso`

The shopper currency.

Use a 3-letter ISO 4217 currency code, such as `EUR`, `USD`, or `GBP`.

#### `PricingSyncId`

The pricing synchronization identifier generated by ESW pricing.

It helps keep storefront pricing aligned with the pricing used in ESW checkout.

#### `IsEswCountry`

This flag determines whether the selected country uses ESW checkout or the retailer’s native checkout.

* When `IsEswCountry` is `true`, LTI can localize storefront prices to the shopper currency and route the shopper to ESW checkout.
* When `IsEswCountry` is `false`, LTI does not apply ESW price conversion and does not redirect the shopper to ESW checkout.

### How checkout uses the cookie

For checkout flows that depend on the browser context, LTI reads the selected country, shopper currency, and pricing state from `ESW_LTI`.

These values help ensure that the storefront state matches the values used when the shopper moves into checkout.

{% hint style="info" %}
Keep the selected country, currency, and pricing state aligned across the storefront and checkout flow. If those values drift, the shopper may see pricing mismatches or be sent to the wrong checkout path.
{% endhint %}


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