Square is operating in the US, Canada, Japan, Australia, and the United Kingdom. Check their website for avaibility in your country.

Square is not fully integrated into Cashy-POS. We communicate the amount due to the Square-application which then can be used to encash the amount. Once the  transaction is approved from Square, you will be snet back to Cashy-POS which then closes the transaction.

Get more information about Square here