How can an integration be called from a process model in Appian?

The correct method to call an integration from a process model in Appian is through a Call Integration Smart Service. This smart service is specifically designed to facilitate the invocation of integrations within a process.

When using the Call Integration Smart Service, developers can easily configure integrations to execute as part of a process flow, allowing for seamless interaction with external systems or APIs. This integration point provides flexibility in passing input parameters and receiving output data, which can then be utilized in subsequent tasks within the process model.

In contrast, the other methods listed do not serve this purpose effectively. For instance, while a Start Process activity is used to initiate a new process instance, it is not intended for invoking integrations. Selecting an integration directly in the process map lacks the structured data handling required for integrations, and using an HTTP request node is more relevant for making direct web service calls, rather than integrating them smoothly within a process flow. Thus, the Call Integration Smart Service is the most appropriate and effective way to accomplish integration calls in Appian process models.