code: func (t *MockTransactor) SendTransaction(tx *fab.Transaction) (*fab.TransactionResponse, error) {
  	response := &fab.TransactionResponse{
  		Orderer: "example.com",
  	}
  	return response, nil
  }
docs: // SendTransaction send a transaction to the chain’s orderer service (one or more orderer endpoints) for consensus and committing to the ledger.