The identity concept is described here.
Retrieve the public keys of an identity using its identifier value (a.k.a.
Authorization: a bearer access token for your organization. Example: Authorization: Bearer 2YotnFZFEjr1zCsicMWpAA
accesstoken(opaque token) (ACR >= 2): just a valid token.
tokentype(string): must be bearer.
X-CSRF-Token: a token to prevent from CSRF attacks.
identifier_value: (string) the identifier value of the identity. Example: firstname.lastname@example.org
The identity public key, the identity AES-RSA public key, and the public keys of the crypto provisions linked to this identity and to the querying org (if querier is an org).