code: public Transaction createTransaction(EvseId evseId) {
          Transaction transaction = new Transaction();
          transaction.setEvseId(evseId);
  
          transactionRepository.insert(transaction);
  
          return transaction;
      }
docs: Creates a transaction identifier. The EVSE identifier is stored for later usage.
  
  @param evseId evse identifier that's stored in the transaction
  @return transaction