How can an orchestration integrate with external systems?

The chosen answer highlights the use of the $Orchestration.Instance system variable as a means of integrating orchestration with external systems. This system variable holds context-specific data related to the orchestration process, which allows for interaction with other components and potentially external systems if properly designed.

However, this option is somewhat limited when it comes to practical integration. External systems typically require a more standardized communication mechanism, which is effectively accomplished through API endpoints. API endpoints allow for real-time data exchange and are a foundational element for connecting different systems, enabling orchestrations to send and receive data from various external sources seamlessly.

Custom code can also facilitate integration, providing the flexibility to handle specific integration scenarios or complex business logic. Nevertheless, it relies on developers' expertise and may introduce additional maintenance overhead.

Flow Documents are more related to the structural design of Salesforce flows rather than directly enabling integration with external systems, making them less relevant for this context.

In summary, while the $Orchestration.Instance system variable plays a role in orchestration processes, using API endpoints is the most effective and widely used method for integrating with external systems, providing a robust framework for communication and data transfer.