To use a Gateway that is not already included in Power Store would require hand coding.
You would need to use the development kit as a reference to hand code the functions that would process the transaction with your selected gateway, we do not offer support for this.
If you would like us to help you implement this, we offer a Premiere support appointment at $99 for 30 minutes of custom development time. I can t say exactly how long it would take us to implement this gateway for you, but it would probably be around 1 to 2 hours.