I believe that Elavon uses the Internet Secure/Interac Online module which is included in our Additional Payment Gateway Plugin.
It is becoming more difficult for us to add more features to the store as we basically do not have the time. We do a lot of custom work and sometimes we are able to introduce some of those features into the latest version of the store.
Because the store plugin is still very OSCommerce friendly, then the end user of the store plugin has the opportunity to add any of the hundreds of different features that the OSC Contribution pages have to offer. This may require a little programming, but it does really open up the scope and potential of WPOLS.
I try to list the latest development on this page:
We are currently adding the Affiliate plugin to our list of available additional plugins.
More info about using OSC Contributions: