/// <summary>
        ///     Accept the user's calling card and add the card to their inventory
        /// </summary>
        /// <param name="client"></param>
        /// <param name="transactionID"></param>
        /// <param name="folderID"></param>
        private void OnAcceptCallingCard(IClientAPI client, UUID transactionID, UUID folderID)
        {
            MainConsole.Instance.DebugFormat(
                "[Universe CALLING CARD MODULE]: User {0} ({1}) accepted tid {2}, folder {3}",
                client.AgentId,
                client.Name,
                transactionID, folderID);
            UUID destID;

            lock (m_pendingCallingcardRequests)
            {
                if (!m_pendingCallingcardRequests.TryGetValue(transactionID, out destID))
                {
                    MainConsole.Instance.WarnFormat(
                        "[Universe CALLING CARD MODULE]: Got a AcceptCallingCard from {0} without an offer before.",
                        client.Name);
                    return;
                }
                // else found pending calling card request with that transaction.
                m_pendingCallingcardRequests.Remove(transactionID);
            }


            IClientAPI friendClient = LocateClientObject(destID);

            // inform sender of the card that destination accepted the offer
            if (friendClient != null)
            {
                friendClient.SendAcceptCallingCard(transactionID);
            }

            // put a calling card into the inventory of receiver
            CreateCallingCard(client, destID, folderID, friendClient.Name);
        }