Where to re-authorize fiscal transactions in Croatia?

One of the major requirements of the fiscal law in Croatia is the online authorization of the transactions. Even if the internet infrastructure in Croatia is very good, there will be for sure cases, where online authorization is not possible. For these cases, the fiscal law has defined a re-authorization, which can take place later.

This means, the POS can finish the transaction even in case there is no online connection with the authorization server (CIS). But every transaction which was finished without online authorization has to be re-authorized later. Later means as defined by the law, within 2 days (calendar days).

Certainly the easiest way to implement the fiscal requirements is, to execute the authorization and re-authorization of the transactions on the POS itself. The POS has anyhow to authorize the transaction this means, the authorization algorithm is already implemented on the POS itself. The logical consequence is to use the same logic for the re-authorization in offline cases.

Unfortunately the question where to implement the re-authorization is not that simple.
Wherever the re-authorization is implemented, it has to cover the following aspects:

  • The not authorized transactions have to be saved
  • There has to be a scheduler, deciding when to retry and to authorize all saved transactions
  • There has to be a process, communicating with the authorization server executing the re-authorization
  • The user needs to get the status of all re-authorized transactions – meaning, there has to be a logging and reporting logic and process

Already now, after the first overview of the required functions it becomes clear, why it could become dangerous to implement the re-authorization on POS.
The re-authorization at POS would mean:

  • several processes have to run in the background of the POS system
  • Transactions have to be stored, maintained and controlled (database management system)
  • The usage of the POS resources e.g. RAM, Processor, Network … is influenced by the fiscal module

As we see the POS application as mission critical we recommend to move the reauthorization tasks to the back office. If retailers have more than one store we recommend to implement the solution in their head office. Head office implementation will significantly reduce the maintenance efforts.

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