OptionalforOptionalidIf the wallpaper was obtained from a messageActionSetChatWallPaper service message, must contain the ID of that message.
The private chat where the wallpaper will be set
OptionalrevertIf we don't like the new wallpaper the other user of the chat has chosen for us using the for_both flag, we can re-set our previous wallpaper just on our side using this flag.
OptionalsettingsWallpaper settings, obtained as described in the wallpaper documentation » or from messageActionSetChatWallPaper . wallpaper . settings .
OptionalwallpaperThe wallpaper » , obtained as described in the wallpaper documentation » ; must not be provided when installing a wallpaper obtained from a messageActionSetChatWallPaper service message ( id must be provided, instead).
Only for Premium users, sets the specified wallpaper for both users of the chat, without requiring confirmation from the other user.