Overview

An "Extension' is a way to extend platform functionality without changing the core platform codebase.
An Extension needs to implement:
​Extension - instance handshake protocol so that it can be added to a platform's instance
​Extension - Project handshake protocol so that it can be added to a platform's Project.
An Extension can visually integrate into Studio, aid data collection for a Creator and provide data for the App and feeds by providing:
​Studio tabs​
​Analytics API​
​Field data source​
​Assets​
​Extension feeds​
An Extension can subscribe to Notifications to be notified of data changes made within the platform.
All requests between an Extension and the platform are signed for security reasons. See Signing requests.
Signing requests
All requests to 3rd party Extension are backend-to-backend and signed with Extension access token. Access token is created Extension deployment time, stored in both the Extension and the platform, and not communicated between them (pre-shared).
Signature calculation
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signature = SHA1(access_token + signeable_content + salt)
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signable_content is a concatenation of the following:
Resource path (including leading slash, e.g. ”/path/to/script”)
Query string (including leading question mark, e.g. ”?attr=value”)
POST data
salt is a random string, it should change from request to request and be sufficiently random.
Salt and generated signature are sent in HTTP headers:
X-LViS-Salt
X-LViS-Signature
Receiving end calculates signature from the access_token stored locally and data from the request and checks if it matches the one in the request. Any request failing signature check must return 403 forbidden.
Instance handshake
To add an Extension to a platform's instance, super admin is to provide three parameters:
Base URL
Access token
Name (used to identify the service in Studio UI)
To complete adding an Extension, the platform sends an Instance handshake request to it.
Raise a support ticket to organise new Extension setup tasks
Extension types
leaderboard
submissions
demographics
timerelease allows to set a lock on assets, like images uploaded for a media element, so that even if the client application knew the url to the asset, the user would not be able to view it until a specific point in time.
Project handshake
An application specifies which Extension(s) it needs. When a Project is created, the platform enables all required Extensions automatically.
The platform sends a Project handshake request to the Extension in the following cases:
A new Extension has been added to the Project
Extension config in the app is changed
Project name is changed
Studio Tabs
Tabs are entries in Studio main menu.
Tabs are fetched by sending a request to the Extension when a Project or an Event is selected in Studio:
​Project-specific tabs​
​Event-specific tabs​
Tab icon
An icon that is shown for the Extension tab on Studio main menu.

Can be any Font Awesome 5.14 icon that support fal prefix including pro icons. 

To specify an icon the tabs response must contain icon field with name of the desired icon.

By default Studio use th icon. 
Example
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[
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  {
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    "name": "Event Segments",
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    "level": "e",
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    "url": "https://example-extension.mic.io/tabs/projects/b10be847-2d51-49b3-a9f9-2429434763d7/event_segments",
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    "icon": "address-book"
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  }
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]
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Auth endpoint
An Extension can check users access rights making Project access or Super admin access request.
Project access
get
 https://environment.lvis.io
/p/:project_id/sessions/:user_session_token?extension_id=demographics
Project access
Super admin access
get
https://environment.lvis.io
/sa_sessions/:user_session_token?service_id=demographics
Super admin access
Notifications
The notifications mechanism is deprecated and will be removed soon. Use webhook events instead when possible.
The purpose is to allow an Extension to use Studio as Event/Element management system, where some processing is done by the Extension. To enable this Studio notifies the Extension whenever data changes are made in Studio. When notified the Extension then fetches up-to-date data from the platform using feeds or Control API.
Please note that notification does not guarantee that any of the data was actually changed after the previous notification, or that the current state of the object is final and complete. So the Extension should track changes by itself.
There can be a lag of a couple of seconds between a change and notification.
On success the Extension needs to respond with 200 and empty body.
On error the Extension needs to respond with corresponding status and empty body.
These are supported notification types:
​Listings notification​
​Elements notification​
Analytics API
This API allows adding a tab with Extension analytics data to the Event's analytics page. The platform enables this feature according to corresponding flag in instance handshake response. The platform makes Analytics request to the Extension to get its data.
Field data source
An Extension can act as a data source for a custom field, providing dynamic content.
Assets
An Extension can provide assets which the platform passes to the App. The platform fetches assets from the Extension by calling Assets.
Extension feeds
Each Extension can provide Extension-specific data feeds. These feeds will be requested from the Extension and uploaded to the public CDN by the platform. Feeds list is configured during instance handshake in the handshake response.
Event feeds are uploaded periodically while event is running. The platform fetches Extension specific Event data feed by calling Event-level feed.
Uploaded public feed will be listed on the Event feeds page, and available at the following URL:
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//<static_host>/events/<first two chars of event uuid>/<event uuid>/<extension_type>/<feed_id>.json
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Webhook events
Subscribing to webhook events is a way to integrate with the platform and perform actions in response to changes, without the need for periodic API pooling.
See webhooks description for more details.