A service can add its own Link elements to the representations of VMware Cloud Director API objects. You can create these service links when you register a service. You can also add or remove the links after you register the service.
You can create multiple service-specific links as part of registering a service. After you register a service, you can add or remove individual links. Service links typically appear in the representations of all objects of a specific type, but you can constrain them to appear in a particular object of that type. Service links are not included in object representations unless the service that created them is enabled.
Note:
You cannot update a service link, but you can remove existing links and create new ones.