Moneris Credit Card web interface needs to change

The Bank of Montreal is retiring the currently implemented credit card interface. We need to migrate to another interface.
It is their MCO interface.
Here is the reference material i have gathered:

How to create your own test store :
• Go to developer portal : https://developer.moneris.com/
• Create an account in the developer portal
• Once you have created your account, you can view your test store id by clicking the profile icon on upper right corner. It will be listed under ‘Test Credentials’
• Go to Merchant Resource Center : https://esqa.moneris.com/mpg/
• Login using your test store id, username, password from developer portal
• Once you are logged in, you need to go to Your Name > Account Information > Security Questions . Please set these and your email in case you forget your password.
Getting Started with Testing :

Test card numbers - https://developer.moneris.com/More/Testing/Testing%20a%20Solution
Response codes - https://developer.moneris.com/More/Testing/Error%20Messages%20and%20Response%20Codes
Penny Value simulator - https://developer.moneris.com/More/Testing/Penny%20Value%20Simulator

Getting started with the MCO integration
• Review documentation:
o https://developer.moneris.com:3000/checkout
o https://github.com/Moneris/eCommerce-Moneris-Checkout

Please advise on the effort to move to this new payment gateway.