@JsonIgnore
        public String toJson() {
            return FunctionUtils.doUnchecked(() -> MAPPER.writeValueAsString(Map.of("input", this)));
        }
This is {@link OpenPolicyAgentRegisteredServiceAccessStrategy} that reaches out
to OPA to check for user access.

@author Misagh Moayyed
@since 7.0.0
core/cas-server-core-services-api/src/main/java/org/apereo/cas/services/OpenPolicyAgentRegisteredServiceAccessStrategy.java