diff --git a/protos/google/cloud/bigquery/datatransfer/v1/datatransfer.proto b/protos/google/cloud/bigquery/datatransfer/v1/datatransfer.proto
index 37accec..b04ff99 100644
--- a/protos/google/cloud/bigquery/datatransfer/v1/datatransfer.proto
+++ b/protos/google/cloud/bigquery/datatransfer/v1/datatransfer.proto
@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC.
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-//
 
 syntax = "proto3";
 
@@ -328,6 +327,11 @@ message DataSource {
     // Return an authorization code for a given Google+ page that can then be
     // exchanged for a refresh token on the backend.
     GOOGLE_PLUS_AUTHORIZATION_CODE = 2;
+
+    // Use First Party Client OAuth. First Party Client OAuth doesn't require a
+    // refresh token to get an offline access token. Instead, it uses a
+    // client-signed JWT assertion to retrieve an access token.
+    FIRST_PARTY_OAUTH = 3;
   }
 
   // Represents how the data source supports data auto refresh.
diff --git a/protos/google/cloud/bigquery/datatransfer/v1/transfer.proto b/protos/google/cloud/bigquery/datatransfer/v1/transfer.proto
index 6e503b6..39e31ab 100644
--- a/protos/google/cloud/bigquery/datatransfer/v1/transfer.proto
+++ b/protos/google/cloud/bigquery/datatransfer/v1/transfer.proto
@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC.
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-//
 
 syntax = "proto3";
 
diff --git a/protos/protos.d.ts b/protos/protos.d.ts
index 4d6a20b..f0db35f 100644
--- a/protos/protos.d.ts
+++ b/protos/protos.d.ts
@@ -739,7 +739,8 @@ export namespace google {
                         enum AuthorizationType {
                             AUTHORIZATION_TYPE_UNSPECIFIED = 0,
                             AUTHORIZATION_CODE = 1,
-                            GOOGLE_PLUS_AUTHORIZATION_CODE = 2
+                            GOOGLE_PLUS_AUTHORIZATION_CODE = 2,
+                            FIRST_PARTY_OAUTH = 3
                         }
 
                         /** DataRefreshType enum. */
diff --git a/protos/protos.js b/protos/protos.js
index 9821648..bc1885d 100644
--- a/protos/protos.js
+++ b/protos/protos.js
@@ -1639,6 +1639,7 @@
                                     case 0:
                                     case 1:
                                     case 2:
+                                    case 3:
                                         break;
                                     }
                                 if (message.dataRefreshType != null && message.hasOwnProperty("dataRefreshType"))
@@ -1740,6 +1741,10 @@
                                 case 2:
                                     message.authorizationType = 2;
                                     break;
+                                case "FIRST_PARTY_OAUTH":
+                                case 3:
+                                    message.authorizationType = 3;
+                                    break;
                                 }
                                 switch (object.dataRefreshType) {
                                 case "DATA_REFRESH_TYPE_UNSPECIFIED":
@@ -1865,12 +1870,14 @@
                              * @property {number} AUTHORIZATION_TYPE_UNSPECIFIED=0 AUTHORIZATION_TYPE_UNSPECIFIED value
                              * @property {number} AUTHORIZATION_CODE=1 AUTHORIZATION_CODE value
                              * @property {number} GOOGLE_PLUS_AUTHORIZATION_CODE=2 GOOGLE_PLUS_AUTHORIZATION_CODE value
+                             * @property {number} FIRST_PARTY_OAUTH=3 FIRST_PARTY_OAUTH value
                              */
                             DataSource.AuthorizationType = (function() {
                                 var valuesById = {}, values = Object.create(valuesById);
                                 values[valuesById[0] = "AUTHORIZATION_TYPE_UNSPECIFIED"] = 0;
                                 values[valuesById[1] = "AUTHORIZATION_CODE"] = 1;
                                 values[valuesById[2] = "GOOGLE_PLUS_AUTHORIZATION_CODE"] = 2;
+                                values[valuesById[3] = "FIRST_PARTY_OAUTH"] = 3;
                                 return values;
                             })();
     
diff --git a/protos/protos.json b/protos/protos.json
index df96606..587c977 100644
--- a/protos/protos.json
+++ b/protos/protos.json
@@ -341,7 +341,8 @@
                               "values": {
                                 "AUTHORIZATION_TYPE_UNSPECIFIED": 0,
                                 "AUTHORIZATION_CODE": 1,
-                                "GOOGLE_PLUS_AUTHORIZATION_CODE": 2
+                                "GOOGLE_PLUS_AUTHORIZATION_CODE": 2,
+                                "FIRST_PARTY_OAUTH": 3
                               }
                             },
                             "DataRefreshType": {
diff --git a/src/v1/data_transfer_service_client.ts b/src/v1/data_transfer_service_client.ts
index f4cecaf..91a6cc0 100644
--- a/src/v1/data_transfer_service_client.ts
+++ b/src/v1/data_transfer_service_client.ts
@@ -18,12 +18,12 @@
 
 import * as gax from 'google-gax';
 import {
-  GaxCall,
   Callback,
   CallOptions,
   Descriptors,
   ClientOptions,
   PaginationCallback,
+  GaxCall,
 } from 'google-gax';
 import * as path from 'path';
 
diff --git a/synth.metadata b/synth.metadata
index 28d29af..8cde129 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -1,5 +1,22 @@
 {
-  "updateTime": "2020-03-31T19:14:07.961639Z",
+  "updateTime": "2020-04-01T11:31:02.754106Z",
+  "sources": [
+    {
+      "git": {
+        "name": "googleapis",
+        "remote": "https://github.com/googleapis/googleapis.git",
+        "sha": "dc65f39f33cb139b3a2244199a3e722a4d94b679",
+        "internalRef": "304035052"
+      }
+    },
+    {
+      "git": {
+        "name": "synthtool",
+        "remote": "https://github.com/googleapis/synthtool.git",
+        "sha": "99820243d348191bc9c634f2b48ddf65096285ed"
+      }
+    }
+  ],
   "destinations": [
     {
       "client": {
diff --git a/system-test/fixtures/sample/src/index.ts b/system-test/fixtures/sample/src/index.ts
index a00f0ba..25b8680 100644
--- a/system-test/fixtures/sample/src/index.ts
+++ b/system-test/fixtures/sample/src/index.ts
@@ -19,7 +19,7 @@
 import {DataTransferServiceClient} from '@google-cloud/bigquery-data-transfer';
 
 function main() {
-  const dataTransferServiceClient = new DataTransferServiceClient();
+  new DataTransferServiceClient();
 }
 
 main();