diff --git a/google/maps/routes/v1/route_service.proto b/google/maps/routes/v1/route_service.proto
index c3512820..d9e9fc1a 100644
--- a/google/maps/routes/v1/route_service.proto
+++ b/google/maps/routes/v1/route_service.proto
@@ -35,6 +35,7 @@ option php_namespace = "Google\\Maps\\Routes\\V1";
 // The Routes Preferred API.
 service RoutesPreferred {
   option (google.api.default_host) = "routespreferred.googleapis.com";
+  option (google.api.oauth_scopes) = "https://www.googleapis.com/auth/maps-platform.routespreferred";
 
   // Returns the primary route along with optional alternate routes, given a set
   // of terminal and intermediate waypoints.
diff --git a/google/maps/routes/v1/routespreferred.yaml b/google/maps/routes/v1/routespreferred.yaml
index 939a4bd8..09615e02 100644
--- a/google/maps/routes/v1/routespreferred.yaml
+++ b/google/maps/routes/v1/routespreferred.yaml
@@ -6,3 +6,22 @@ title: Routes Preferred API
 apis:
 - name: google.maps.routes.v1.RoutesPreferred
 - name: google.maps.routes.v1alpha.RoutesAlpha
+
+authentication:
+  rules:
+  - selector: google.maps.routes.v1.RoutesPreferred.ComputeRouteMatrix
+    oauth:
+      canonical_scopes: |-
+        https://www.googleapis.com/auth/maps-platform.routespreferred
+  - selector: google.maps.routes.v1.RoutesPreferred.ComputeRoutes
+    oauth:
+      canonical_scopes: |-
+        https://www.googleapis.com/auth/maps-platform.routespreferred
+  - selector: google.maps.routes.v1alpha.RoutesAlpha.ComputeRouteMatrix
+    oauth:
+      canonical_scopes: |-
+        https://www.googleapis.com/auth/maps-platform.routespreferred
+  - selector: google.maps.routes.v1alpha.RoutesAlpha.ComputeRoutes
+    oauth:
+      canonical_scopes: |-
+        https://www.googleapis.com/auth/maps-platform.routespreferred
diff --git a/google/maps/routes/v1alpha/route_service.proto b/google/maps/routes/v1alpha/route_service.proto
index ec756bb1..b8cb29cc 100644
--- a/google/maps/routes/v1alpha/route_service.proto
+++ b/google/maps/routes/v1alpha/route_service.proto
@@ -35,6 +35,7 @@ option php_namespace = "Google\\Maps\\Routes\\V1alpha";
 // The Routes Preferred API.
 service RoutesAlpha {
   option (google.api.default_host) = "routespreferred.googleapis.com";
+  option (google.api.oauth_scopes) = "https://www.googleapis.com/auth/maps-platform.routespreferred";
 
   // Returns the primary route along with optional alternate routes, given a set
   // of terminal and intermediate waypoints.