Introducing an API gateway as a management service helps solve complexities around managing Microservices there by letting developers focus better on solving business problems. The API Gateway will be responsible to providing the supporting services for securing, managing, publishing, and consuming Microservices. This expedites consumer onboarding by automating most of the management processes.

API Gateway also have the capability of abstracting the deployment location of the actual APIs:

Microsoft API Management is a feature rich service which can act like a gateway for Microservices. API management comes with built-in capabilities around discoverability, security, analytics, business insights, documentation, and transformations which can help enhance the experience around consumption of Microservices to a great extent. More about API management can be found at: https://azure.microsoft.com/en-us/services/api-management/.