Worldpay setup and integration on Opencart website

General information for the website: We sell Juices online and currently use just paypal
Kind of development: Customization of existing website
Num. of web pages/modules: 1
Description of every page/module: We currently have an opencart website that accepts paypal. We have been approved for a Worldpay account and need someone that can integrate both the Worldpay side of things and the Opencart end.

Currently we dont have the knowledge to complete the worldpay back office setup and then get the website to communicate with the new worldpay account.
Description of requirements/features: You should be experienced at dealing with the setup of worldpay not only from an opencart point of view, but also on the actual worldpay Test/Production/Start Trading back office screens.

Our site is www.juiceprogrammes.com
Payment methods: Credit Card, Specific Payment Gateway, Other
Extra notes: