code: func (t *MockTransactor) SendTransaction(tx *fab.Transaction) (*fab.TransactionResponse, error) {
  	rqtx, cancel := contextImpl.NewRequest(t.Ctx, contextImpl.WithTimeout(10*time.Second))
  	defer cancel()
  	return txn.Send(rqtx, tx, t.Orderers)
  }
docs: // SendTransaction send a transaction to the chain’s orderer service (one or more orderer endpoints) for consensus and committing to the ledger.