Missionaries are called by God, but they are sent by fellowships of believers. Even the Apostle Paul was commissioned by the believers in Antioch.
This all makes good sense. A WEC missionary is sustained in ministry by what God provides through the direct giving of churches and individual believers to that particular missionary. A fervent Christian who is living a life of service within his or her church fellowship, and beyond it, will naturally win the trust of others. Fellow believers want to pray for and get behind the ministry of someone they see using their gifts to the glory of God. Of course, having the confidence of others is no guarantee of ministry success. However, lack of that trust is fatal. WEC doesn't send missionaries who lack the confidence of their home church.