protected String determineIssuer() {
        return StringUtils.defaultIfBlank(this.issuer, configurationContext.getCasProperties().getServer().getPrefix());
    }
This is {@link OAuth20JwtAccessTokenEncodableCipher}.

@author Misagh Moayyed
@since 7.2.0
support/cas-server-support-oauth-core-api/src/main/java/org/apereo/cas/support/oauth/web/response/accesstoken/response/OAuth20JwtAccessTokenEncodableCipher.java