onInvitationDeclinedFromGroup method
Implementation
@protected
void onInvitationDeclinedFromGroup(
    String groupId, String invitee, String? reason) {
  for (var observer in List<ChatUIKitObserverBase>.of(observers)) {
    if (observer is GroupObserver) {
      observer.onInvitationDeclinedFromGroup(groupId, invitee, reason);
    }
  }
}