# Prerequisites for offline e-Invoice application

ClearTax offline application is built on Java and incorporates all the algorithms prescribed by ZATCA to generate compliant electronic invoices from PoS terminals. To ensure that the application is successfully installed and operated on the there are a few prerequisites.

Below are the list of prerequisites to install the ClearTax offline application on the NCR Aloha PoS terminals:

1. General Prerequisites:
   1. The VAT of the taxpayer should be whitelisted for phase 2 of ZATCA e-Invoicing
   2. The offline application will run only on NCR Fiscal Manager 19.3 and above
2. Software prerequisites to ensure smooth functioning:
   1. Java SDK version 11 or higher must be installed on the system
   2. The system should have the ability to run and execute commands on CLI
3. The application will perform best under the following hardware specifications:
   1. RAM of 512 mb or more is recommended for quick generation of e-Invoices
   2. A minimum free storage space of 1 gb should be available on the PoS terminal for optimum processing without disruption


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