Group call identifier.
The number of Telegram Stars the user agreed to pay to send the message; for live stories only; 0-getOption("paid_group_call_message_star_count_max"). Must be 0 for messages sent to live stories posted by the current user.
Text of the message to send; 1-getOption("group_call_message_text_length_max") characters for non-live-stories; see updateGroupCallMessageLevels for live story restrictions, which depends on paid_message_star_count. Can't contain line feeds for live stories.
Sends a message to other participants of a group call. Requires groupCall.can_send_messages right. Request type for Tdjson#sendGroupCallMessage.