Moneris is a payment solution for Canada and US.
It supports also Moneris HPP payment system.
Commerce Moneris is a payment module that integrates the Moneris payment system with Drupal Commerce.
It works with both versions of Moneris Api. The US and Canada versions.
To use the US or Canada version, your store should be register as US respective Canada store.
It allows you to use also SSL communication between your site and moneris servers.
For Moneris Sandbox credentials and how to check your sandbox payments, please refer to README.txt file.