You are a cloud solutions architect tasked with designing the integration layer for a new enterprise application that will leverage cloud services for various functionalities, including storage, computing, and third-party service interactions. The application's architecture requires communication with both internal and external services, which may have different requirements for message security, transaction support, and interoperability. Considering the diverse ecosystem of services and the need for a robust and flexible integration strategy, which two types of APIs should you prioritize for this integration to ensure broad compatibility and adherence to industry standards?