Need consultancy to setup API subscription management through AWS API gateway for our existing APIs hosted on windows server

We need consultancy to setup AWS API gateway for our existing APIs hosted on our windows server, our goal is to provides our APIs in a secure manner to our multiple clients, APIs are hosted and running on our windows server. Subscription management, Authentication and Authorization should also need to be managed through AWS services. We only require a sample to be done so that we can do it as and when require.