This option controls which Moneris ECI/Crypt Level transactions are processed with.
Please be aware that this setting applies to ALL processed transactions.
Some processors might have special rules and requirements that transactions must fulfill to fit in a specific ECI/Crypt level.
It is your own responsibility to familiarize yourself with these rules, and make sure you choose the right ECI/Crypt level for your scenario.
If you're unsure, please contact Moneris support, who should be able to help you determine requirements for your processor.