# Configuration File Settings
This part covers the containing of the `/core/app_config.json` file.
* `use_for_liveness` – the option is used when bank managers are taking clients' videos. If the option is set to `true`, mobile devices use the back camera by default, and on desktop, flip and oval circling are off.
* `preinit` – this optional parameter switches on the preliminary loading of scripts and face detection initialization. This is needed to reduce the `plugin` loading time. The default value is `off` that means all the scripts are loaded after calling `OzLiveness.open()`. The `script` value means that the scripts will be loaded before the plugin launches. The `full` value enables preliminary loading of scripts and face detection initialization.
* `architecture` – this optional parameter is used to choose the architecture for Web SDK. The default value is `normal`.
* `normal` is used for the full Oz API version;
* `lite` is used for [Instant API](/oz-knowledge/guides/developer-guide/api/oz-api/instant-api-non-persistent-mode.md);
* `capture` is used for the [mode](/oz-knowledge/guides/developer-guide/sdk/oz-liveness-websdk/web-plugin/launching-the-plugin/capturing-video-and-description-of-the-on_capture_complete-callback.md) that aims to work directly with client backend. In this mode, Oz Liveness Web Plugin can be distributed via static files only (without the adapter part; implemented in 0.7.4);
* `api_url` – Oz API server address, a text parameter;
* `api_token` – Oz API access token, a text parameter;
* `api_use_token` – a parameter to specify the source of the Oz API access token for the system. Possible values = `config`, `client`.
* If the parameter value is `client`, then an Oz API access token is expected to be derived from the JS plug-in;
* If you specify `config` in this parameter, a token will be retrieved from the api\_token parameter of the Oz Liveness Web Adapter configuration file.
* `video_actions_list` – block of video file tags used in the system, a text array. [Current tag list](https://doc.ozforensics.com/oz-knowledge/guides/developer-guide/api/oz-api/media-tags#tags-for-video-files).
* `photo_actions_list` – block of photo file tags used in the system, a text array. [Current tag list](https://doc.ozforensics.com/oz-knowledge/guides/developer-guide/api/oz-api/media-tags#tags-for-photo-files).
* `actions_default_importance` – this parameter specifies whether override with an actions array from a web plug-in is allowed at launching an analysis. Possible values = `true`, `false`;
* If `true`, the Adapter will use an actions array from the configuration file.
* If `false`, the Adapter will use an actions array forwarded from your browser with the use of the `open(options)` method.
* `actions_default` – the actions array. Options include:
* `video_count` – the number of transmitted video files, a numeric parameter;
* `photo_front` – whether there is a front-side page in the document. Possible values = `true`, `false;`
* `photo_back` – whether there is a back-side page in the document. Possible values = `true`, `false`.
* `analyses` – a block for configuring the launch of analyses. Options include:
* `quality` – launch of Oz Liveness analysis. Possible values = `true`, `false`;
* `biometry` – launch of Oz Biometry analysis. Possible values = `true`, `false`;
* `documents` – launch of Oz Text analysis. Possible values = `true`, `false`;
* `collection_ids` (since 1.4.0) – an array of the identifiers of collections for the Black List analysis.
* `extract_best_shot` – a parameter that specifies if a direct link to the best shot (bestshot) extracted from the video should be appended to the analysis result. Possible values = `true`, `false`. If `true`, the response will contain a link to the extracted image in`output_images` (`results_media`);
* `result_mode` – a parameter that specifies the contents of the server response with verification results. Possible values:
* `safe` – only the state of analyses is returned (completed or not yet);
* `status` – results of completed analyses are returned;
* `folder` – same as status but with folder identifier added.
* `result_codes`– a block of response codes with annotations.
* `delete_old_sessions`: `true`, `false`– whether you want to delete old sessions
* `delete_old_sessions_offset_minutes`: `***`– old sessions deletion time offset (in minutes)
* `video_required_actions_list`– the array of required actions
```javascript
"video_required_actions_list":
[
"video_selfie_smile"
],
```
* `video_file_format` – optional; here you can choose the video file format. This video file is passed to the `api`. Possible values: `zip` (recommended) and `mov` (less secure). If you need to retrieve your captured video in the MP4 format, please find the instructions [here](/oz-knowledge/guides/developer-guide/sdk/oz-liveness-websdk/web-plugin/launching-the-plugin/capturing-video-and-description-of-the-on_capture_complete-callback.md#please-note).
* `debug` (since 1.1.0) – if `true`, enables access to the /debug.php page, which contains information about the current configuration and the current license.
* `load_3d_mask` (since 1.2.1) – if `true`, loads the model to process the video taken with the 3D mask functionality. The default value is `false` which means that the model is not used, and the 3D mask is unavailable (the `enable_3d_mask` parameter is being ignored).\ On January 1, 2027, 3D Mask will become unavailable.
* `enable_3d_mask` (since 1.2.1) – enables the 3D mask as the default face capture behavior. This parameter works only if `load_3d_mask` is set to `true`; the default value is `false`.\ On January 1, 2027, 3D Mask will become unavailable.
* `master_license_signature` (since 1.3.1) – the parameter for the master license signature; the default value is `null`.
* `results_polling_interval` (since 1.4.0) – the interval for polling for the analyses’ results in ms; the default value is 1000.
* `get_user_media_timeout` (since 1.5.0) – it defines camera access timeout in sec; after this timeout it displays a hint on how to solve the problem; `default_default` for all browsers and `android_facebook` for Facebook
```javascript
"get_user_media_timeout": {
"default_default": 40,
"android_facebook": 5
}
```
* `disable_adapter_errors_on_screen` (since 1.5.0) – if `true`, disables the display of errors in modal windows, allowing you to view them solely using the `on_error` callback. The default value is `False`.
* `auth` (since 1.7.14) – defines whether and what authorization is used:
* `true` (default) – authorization is required and is based on the generated key;
* `user:pass` – authorization is required and is based on the user login and password;
* `false` – no authorization needed.
* `use_wasm_container` (since 1.9.2) – if `true`, enables functionality of [OzCapsula Data Container](/oz-knowledge/general/readme/proprietary-format-ozcapsula-data-container.md). The default value is `False`.
* `api_use_session_token` (since 1.9.2) – defines how the session token is obtained and transmitted.
* `client` (default) – you obtain the token via the API call as described [here](/oz-knowledge/guides/developer-guide/api/oz-api/ozcapsula-data-container.md#obtaining-a-session-token).
* `api` – the session token is being obtained automatically.
---
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