The string source name (such as application or function name) that indicates the origin of the request.

The external ID source that determines which external reference source is used to perform an external ID lookup.

The identifier of the Avionté BOLD user on whose behalf the request is performed. Used to establish the user context for auditing, permission checks, and user-attributed actions. This value must correspond to a valid, active Avionté Back Office user. If the identifier cannot be resolved, the request is rejected.