upgrade payment gateway with Cube Cart and Sage Pay

Closed - This job posting has been filled and work has been completed.

Job Description

I currently use sage pay as my service provider to take credit card payments but need to upgrade to ver 3 of sage pay -
The upgrade Integration Guideline http://www.sagepay.com/sites/default/files/downloads/sagepaydirectprotocolandintegrationguidelinesv3.0_1.pdf.