Final answer:
The HR Integration Service is the module used to document the URL and integration details for a third-party application in the HR system.
Step-by-step explanation:
The correct answer to the question is HR Integration Service which is the module used to document the URL, basic integration properties, and inbound and outbound username and password information for a third-party application. The HR Integration Service is a key component in enterprise systems that allows disparate systems to communicate with each other. By providing a documented gateway, this service enables secure data exchange and synchronization between the HR system and other third-party applications.