View Source ExTDLib.Method.SetChatAccentColor (ExTDLib v0.0.4)

Changes accent color and background custom emoji of a chat. Supported only for channels with getOption("channel_custom_accent_color_boost_level_min") boost level. Requires can_change_info administrator right. Returns object_ptr<Ok>.

NameTypeDescription
chat_idstringChat identifier.
accent_color_idnumberIdentifier of the accent color to use.
background_custom_emoji_idstringIdentifier of a custom emoji to be shown on the reply header background; 0 if none.

More details on telegram's documentation.