diff --git a/okapi-patient-registration.proto b/okapi-patient-registration.proto
index 3e6db98..ba7ff4e 100644
--- a/okapi-patient-registration.proto
+++ b/okapi-patient-registration.proto
@@ -12,7 +12,7 @@ message PatientRegistrationData {
 	PatientMeta subject = 1;
 	bool registered = 2;
 	string id = 3;
-	google.protobuf.Struct callbackProtocolMeta = 4;
+	google.protobuf.Struct callbackProtocolData = 4;
 }
 
 message PatientMeta {
diff --git a/okapi-service-config.proto b/okapi-service-config.proto
index 79666e2..f4729ad 100644
--- a/okapi-service-config.proto
+++ b/okapi-service-config.proto
@@ -65,10 +65,14 @@ message ServiceConfiguration {
 	CallbackConfiguration push = 4;
 }
 
-message ListServicesRequest {
-}
+message ListServicesRequest {}
 
 message ListServicesResponse {
 	repeated ServiceDefinition availableServices = 1;
+}
+
+message ListServiceConfigurationsRequest {}
+
+message ListServiceConfigurationsResponse {
 	repeated ServiceConfiguration configurations = 2;
-}
\ No newline at end of file
+}
diff --git a/okapi.proto b/okapi.proto
index 8443130..315ad3f 100644
--- a/okapi.proto
+++ b/okapi.proto
@@ -14,6 +14,7 @@ service OkAPI {
     // Configuration
     rpc ConfigureCallback (ConfigureCallbackRequest) returns (ConfigureCallbackResponse) {}
     rpc ListServices (ListServicesRequest) returns (ListServicesResponse) {}
+    rpc ListServiceConfigurations (ListServiceConfigurationsRequest) returns (ListServiceConfigurationsResponse) {}
 
     rpc UpdatePatientRegistration (UpdatePatientRegistrationRequest) returns (UpdatePatientRegistrationResponse) {}
     rpc ListPatientRegistration (ListPatientRegistrationRequest) returns (ListPatientRegistrationResponse) {}