Develop a Magento plugin to connect Magento platform to a credit card payment gateway

We want a Magento integration developed which will meet the following requirements. - The extension must allow the card holders to enter their credit card details and complete the checkout process - The credit card details must be submitted to our payment processor (EP2 Global) in real-time - The order must be updated based on the payment results returned by the processor - When a payment is processed through the payment processor, it returns a unique handle for that card details - This handle must be saved against the customer details, so that the customer doesn't have to re-enter the card details next time - Repeat customer must be given the option of paying using previously used credit card or a different card - The shop owner must be able to process the payment via the Magento backend for phone orders. - The shop owner must be able to process a refund via the Magento backend for returns. The target Magento Platform is Magento Enterprise The technical documentation for the payment processor is attached. A payment processor test account will be supplied to the selected Freelancer.