Restriction reason.
See here » for the full flow to use for restricted or age-gated content.
Constructor schema is available as of layer 105. Switch »| Name | Type | Description | 
|---|---|---|
| platform | string | Platform identifier (ios, android, wp, all, etc.), can be concatenated with a dash as separator ( android-ios,ios-wp, etc) | 
| reason | string | Restriction reason ( porno,terms, etc.). Ignore this restriction reason if it is contained in the ignore_restriction_reasons » client configuration parameter. | 
| text | string | Error message to be shown to the user | 
The MTProto API has multiple configuration parameters that can be fetched with the appropriate methods.
Some legislations require age verification to view restricted content: Telegram implements this through the Main Mini App of a special bot.