By looking at the AEM client (com.adobe.granite.auth.ims.impl.IMSTokenValidatorImpl) I assume that at least the following claims are contained in there
created_at
expires_in
Please document the format of the access token so that it can be validated without having to consider the other properties from the OAuth response (https://tools.ietf.org/html/rfc6749#section-4.1.4).
It seems that the access token being issued by https://www.adobe.io/authentication/auth-methods.html#!AdobeDocs/adobeio-auth/master/JWT/JWT.md#exchanging-jwt-to-retrieve-an-access-token is a JWT itself but it doesn't seem to follow https://tools.ietf.org/html/draft-ietf-oauth-access-token-jwt-07#section-2.
By looking at the AEM client (com.adobe.granite.auth.ims.impl.IMSTokenValidatorImpl) I assume that at least the following claims are contained in there
Please document the format of the access token so that it can be validated without having to consider the other properties from the OAuth response (https://tools.ietf.org/html/rfc6749#section-4.1.4).