In this case study, the organization is the first to assist diplomats in Europe in immediately claiming their VAT-free and tax-free benefits. They desired to upgrade from the prior legacy system. They employed WEM's platform to migrate their older system to a no-code environment. The application's invoicing and billing systems were fully connected, and advanced mathematical fuel tax computation algorithms were designed and incorporated. The key goal was to improve the fuel tax computation algorithm so that it was faster and easier to maintain than their historical system.