Buckaroo plugin not working

I have bought the Buckaroo plugin for Membership pro but it's not working. I keep getting an error when being redirected to Buckaroo. No matter what settings I use. After buying the plugin I noticed that it says that it has been last updated in september 2010? Is this correct? Using the test mode I get an error as well.brq_culture = Value (Missing) Basic field errors:Culture missing fallback to default: en-US ( brq_culture Missing )   

Hi Justin

Yes. The plugin has not been updated for long time. But from what I see recently (not many customers use it, but there was a customer use it recently and it worked)

So for this case, could you please submit a support ticket sending us super user account of your site and link to the subscription form so that I can check to see what's wrong and get it sorted?

Tuan