Chapter 5 Designing the integration Layer The API gateway exposes the services to the client application; the authentication and authorization module is part of the integration platform. The integration layer consists of API providers and API consumers. The API consumer consumes data and messages from other applications and implements authentication and authorization using respective modules, along with the integration logic and business logic related to particular services as per the API provider, which is consumed by the DXP UI layer (mobile and desktop client applications), other applications and platforms such as a blockchain network, IoT platforms, and AI platforms. Multiple integration services like social media services, analytics services, OTP services, and third-party services are consumed by the API consumer, whereas the API provider provides transformed API to the DXP client application. As shown in Figure 5-4, API consumers are responsible for consuming the data and consumed data is transformed by the integration layer, and API providers are responsible for exposing services to the UI layer. Figure 5-4. DXP monolithic integration 169