How does Identity organize external IDs?

The organization of external IDs in Identity is accomplished by pairing them with a corresponding ID type. This means that for each external ID, there is a defined and specific category or type that it belongs to, such as those associated with different authentication providers or systems. This pairing is essential because it ensures clarity in distinguishing between various types of identities, allowing for effective management and integration within the system. The ID type provides context and structure, facilitating interactions with external systems by clearly identifying how the ID should be interpreted and used.

While other methods, such as assigning arbitrary names or categorizing IDs into user roles, might seem plausible, they do not provide the structural integrity and clarity that pairing an external ID with a corresponding ID type offers. Storing IDs in a central database may be part of the broader architecture of Identity, but it does not specifically address the organization aspect as directly as the pairing with ID types does. Thus, the correct answer focuses on how external IDs are systematically organized to maintain coherence and functionality within the Identity framework.