> For the complete documentation index, see [llms.txt](https://developers-apps-in-toss.toss.im/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developers-apps-in-toss.toss.im/documentation/api-and-sdk-en/sdk/domains-api.md).

# Domains API

a public interface grouped in the form of a function-based (flat) API **domain.action** It is a public interface grouped in the form of a function-based API. You can keep using the function-based API as is, and the domain interface additionally provides the same implementation grouped by domain.

The document structure follows this directory structure as is — the REFERENCE.md in the domain directory is the overview, `domain/member/REFERENCE.md`is the member details.

### Domain list

| Domain                                                                        | Description                             |
| ----------------------------------------------------------------------------- | --------------------------------------- |
| [Ads](/documentation/api-and-sdk-en/sdk/domains-api/ads.md)                   | Interstitial, AdMob, and banner ads     |
| [Analytics](/documentation/api-and-sdk-en/sdk/domains-api/analytics.md)       | Analytics logs and screen logging       |
| [Clipboard](/documentation/api-and-sdk-en/sdk/domains-api/clipboard.md)       | Clipboard read/write                    |
| [Device](/documentation/api-and-sdk-en/sdk/domains-api/device.md)             | Device, permissions, location, media    |
| [Environment](/documentation/api-and-sdk-en/sdk/domains-api/environment.md)   | Runtime environment, version, network   |
| [File](/documentation/api-and-sdk-en/sdk/domains-api/file.md)                 | File saving, PDF viewer                 |
| [Game](/documentation/api-and-sdk-en/sdk/domains-api/game.md)                 | Game Center leaderboard, profile        |
| [IAP](/documentation/api-and-sdk-en/sdk/domains-api/iap.md)                   | In-app purchases                        |
| [Notification](/documentation/api-and-sdk-en/sdk/domains-api/notification.md) | Notification consent                    |
| [Permissions](/documentation/api-and-sdk-en/sdk/domains-api/permissions.md)   | Check/request device permissions        |
| [Promotion](/documentation/api-and-sdk-en/sdk/domains-api/promotion.md)       | Promotional rewards, friend invitations |
| [Review](/documentation/api-and-sdk-en/sdk/domains-api/review.md)             | Request in-app review                   |
| [SafeArea](/documentation/api-and-sdk-en/sdk/domains-api/safearea.md)         | Get/subscribe to Safe Area insets       |
| [Screen](/documentation/api-and-sdk-en/sdk/domains-api/screen.md)             | Screen control                          |
| [Share](/documentation/api-and-sdk-en/sdk/domains-api/share.md)               | Share links, share sheet                |
| [Storage](/documentation/api-and-sdk-en/sdk/domains-api/storage.md)           | Local storage                           |
| [TossAuth](/documentation/api-and-sdk-en/sdk/domains-api/tossauth.md)         | Toss login, signing                     |
| [TossPay](/documentation/api-and-sdk-en/sdk/domains-api/tosspay.md)           | Toss Pay payment authentication         |
| [User](/documentation/api-and-sdk-en/sdk/domains-api/user.md)                 | User key, consent data, age             |

### Relationship with the function-based API

```js
// Function-style (flat) API — same as v2
import { getAnonymousKey } from "@apps-in-toss/web-framework";
await getAnonymousKey();

// Domain interface — the same implementation as domain.actions
import { User } from "@apps-in-toss/web-framework";
await User.getAnonymousKey();
```

If you call a domain member on an unsupported Toss app version `undefined`does not return `UNSUPPORTED_APP_VERSION` an error **throw**it throws it (the function-based API keeps the existing (v2) behavior as is). That member `isSupported()`can be checked in advance with


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