onInvitationReceivedFromGroup method Null safety
Occurs when an invitation is rejected by the inviter.
Param groupId
The group ID.
Param groupName
The group name.
Param inviter
The username of the inviter.
Param reason
The reason.
Implementation
void onInvitationReceivedFromGroup(
String groupId, String? groupName, String inviter, String? reason);