Custom Store - HPP - INTERAC Online

Hello,

 

I am in the process of configuring a custom test store. I do not see an option for Interac Online. The Hosted Paypage section of public stores contains an option for INTERAC Online.

However, the custom store Hosted Paypage does not contain this configuration option:

How do I enable INTERAC online for Hosted Paypages in a custom store environment?