post
https://Use API Lookup for a base URL/crossRealmTrusts/sources//targets/
Create or update a CrossRealmTrust that allows LinkableResources to be received from the source of the resource. The source HRN is defined by either the home project or the realm of the resource. The CrossRealmTrust is established with a target specified in the path which could either be a specific project or the entire realm. An access token from an identity with appropriate privileges in the target realm should be used to create/update the CrossRealmTrust.
Access Control:
- The calling principal must have "manageCrossRealmTrust" action permission for the resource "{realm}" in the "authorization" service. The "{realm}" here represents the HRN of represent the target realm.
- This permission is granted to all entities with roles OrgAdmin or CrossRealmTrustManager.
- The calling principal MUST NOT include a project scope.