View Source ExTDLib.Object.ChatEventBackgroundCustomEmojiChanged (ExTDLib v0.0.4)

The chat's custom emoji for reply background was changed.

NameTypeDescription
old_background_custom_emoji_idstringPrevious identifier of the custom emoji; 0 if none.
new_background_custom_emoji_idstringNew identifier of the custom emoji; 0 if none.

More details on telegram's documentation.