Create a module that allows MicroInvest POS Software to exchange data with a web-based loyalty application

We are using a web-based loyalty management application called loyal2.com. The system allows a merchant to keep track of sales transactions by registered customers in order to keep track of points which can then entitled them to get discounts, gifts and rewards through unique voucher codes. For example, when a customer has spent $100, he can receive a $10 discount voucher by email with a unique number on it that he can present to a teller. The teller verifies that the code has not been used in the past and if the voucher code is valid, he marks the voucher as "redeemed" and gives the $10 discount to the customer. This process is normally done through a [login to view URL] web application that a teller has access to. On the other side, we have locations (a restaurant and a retail store) which are using MicroInvest Warehouse Pro. We would like to set up a bridge between MicroInvest Warehouse Pro and [login to view URL] as follows: 1) Make MicroInvest post a packet of data each time a sale is captured to [login to view URL] (via this API: [login to view URL]) which includes sales and customer details (customer ID, sales amount, sales date, invoice ID) 2) Add a 'voucher lookup' feature in MicroInvest which allows the teller to apply any available vouchers from [login to view URL] to a sale as a payment method in MicroInvest. We want a solution that can be deployed easily and can be used by any store that is using MicroInvest Warehouse Pro and loyal2 or any loyal2-based web application. Any creative solution to achieve both objectives are welcome.