diff --git a/plugins/arcgis/service/src/ArcGISConfig.ts b/plugins/arcgis/service/src/ArcGISConfig.ts
index be99ed10b..82b69a769 100644
--- a/plugins/arcgis/service/src/ArcGISConfig.ts
+++ b/plugins/arcgis/service/src/ArcGISConfig.ts
@@ -85,12 +85,22 @@ export interface ArcGISAuthConfig {
     /**
      * The username for authentication.
      */
-    username: string
+    username?: string
 
     /**
      * The password for authentication.
      */
-    password: string
+    password?: string
+
+    /**
+     * The Client Id for OAuth
+     */
+    clientId?: string
+
+    /**
+     * The Client secret for OAuth
+     */
+    clientSecret?: string
 }
 
 /**
diff --git a/plugins/arcgis/service/src/HttpClient.ts b/plugins/arcgis/service/src/HttpClient.ts
index a68841f80..5c4497dd8 100644
--- a/plugins/arcgis/service/src/HttpClient.ts
+++ b/plugins/arcgis/service/src/HttpClient.ts
@@ -121,11 +121,14 @@ export class HttpClient {
      * Sends a get request to the specified url.
      * @param url The url of the get request.
      */
-    sendGet(url: string) {
+    async sendGet(url: string): Promise<any> {
         const console = this._console
+        let response;
         this.sendGetHandleResponse(url, function (chunk) {
             console.log('Response: ' + chunk);
+            response = chunk;
         })
+        return response;
     }
 
     /**
diff --git a/plugins/arcgis/service/src/index.ts b/plugins/arcgis/service/src/index.ts
index a008ee345..66902d6cb 100644
--- a/plugins/arcgis/service/src/index.ts
+++ b/plugins/arcgis/service/src/index.ts
@@ -12,7 +12,6 @@ import { FeatureServiceResult } from './FeatureServiceResult'
 import { ArcGISIdentityManager } from "@esri/arcgis-rest-request"
 // import { IQueryFeaturesOptions, queryFeatures } from '@esri/arcgis-rest-feature-service'
 
-
 const logPrefix = '[mage.arcgis]'
 const logMethods = ['log', 'debug', 'info', 'warn', 'error'] as const
 const consoleOverrides = logMethods.reduce((overrides, fn) => {
@@ -65,25 +64,44 @@ function getServerUrl(featureServiceUrl: string): string {
    *
    * @throws {Error} If the identity manager could not be created due to missing required query parameters.
    */
-async function handleAuthentication(req: express.Request): Promise<ArcGISIdentityManager> {
+async function handleAuthentication(req: express.Request, httpClient: HttpClient): Promise<ArcGISIdentityManager> {
   const featureUsername = req.query.username as string | undefined;
   const featurePassword = req.query.password as string | undefined;
+  const featureClientId = req.query.clientId as string | undefined;
+  const featureClientSecret = req.query.clientSecret as string | undefined;
   const featureServer = req.query.server as string | undefined;
   const featurePortal = req.query.portal as string | undefined;
   const featureToken = req.query.token as string | undefined;
+  const portalUrl = getPortalUrl(req.query.featureUrl as string ?? '');
 
   let identityManager: ArcGISIdentityManager;
 
   try {
     if (featureToken) {
       console.log('Token provided for authentication');
-      identityManager = await ArcGISIdentityManager.fromToken({ token: featureToken, server: getServerUrl(req.query.featureUrl as string ?? ''), portal: getPortalUrl(req.query.featureUrl as string ?? '') });
+      identityManager = await ArcGISIdentityManager.fromToken({ token: featureToken, server: getServerUrl(req.query.featureUrl as string ?? ''), portal: portalUrl });
     } else if (featureUsername && featurePassword) {
       console.log('Username and password provided for authentication, username:' + featureUsername);
       identityManager = await ArcGISIdentityManager.signIn({
         username: featureUsername,
         password: featurePassword,
-        portal: getPortalUrl(req.query.featureUrl as string ?? ''),
+        portal: portalUrl,
+      });
+    } else if (featureClientId && featureClientSecret) {
+      console.log('ClientId and Client secret provided for authentication');
+      const params = {
+        client_id: featureClientId,
+        client_secret: featureClientSecret,
+        grant_type: 'client_credentials',
+        expiration: 900
+      }
+
+      const url = `${portalUrl}/oauth2/token?client_id=${params.client_id}&client_secret=${params.client_secret}&grant_type=${params.grant_type}&expiration=${params.expiration}`
+      const response = await httpClient.sendGet(url);
+      identityManager = await ArcGISIdentityManager.fromToken({
+        clientId: featureClientId,
+        token: JSON.parse(response)?.access_token || '',
+        portal: portalUrl
       });
     } else {
       throw new Error('Missing required query parameters to authenticate (token or username/password).');
@@ -118,21 +136,15 @@ const arcgisPluginHooks: InitPluginHook<typeof InjectedServices> = {
     // - Move getPortalUrl to Helper file
     // - Update layer token to get token from identity manager
     // - Move plugins/arcgis/web-app/projects/main/src/lib/arc-layer/arc-layer.component.ts addLayer to helper file and use instead of encodeURIComponent
+    // - Remove Client secret from returned Config object if applicable
 
     const processor = new ObservationProcessor(stateRepo, eventRepo, obsRepoForEvent, userRepo, console);
     processor.start();
     return {
       webRoutes: {
         public: (requestContext: GetAppRequestContext) => {
-          const routes = express.Router().use(express.json())
-          routes.post('/oauth/signin', async (req, res, next) => {
-            // TODO implement
-          })
-
-          routes.post('/oauth/authenticate', async (req, res, next) => {
-            // TODO implement
-          })
-
+          const routes = express.Router().use(express.json());
+          // TODO: Add User initiated Oauth
           return routes
         },
         protected: (requestContext: GetAppRequestContext) => {
@@ -165,15 +177,15 @@ const arcgisPluginHooks: InitPluginHook<typeof InjectedServices> = {
               const featureUrl = req.query.featureUrl as string;
               console.info('Getting ArcGIS layer info for ' + featureUrl)
               let identityManager: ArcGISIdentityManager;
+              const httpClient = new HttpClient(console);
 
-            try {
-              identityManager = await handleAuthentication(req);
+              try {
+                identityManager = await handleAuthentication(req, httpClient);
 
-              const featureUrlAndToken = featureUrl + '?token=' + encodeURIComponent(identityManager.token);
-              console.log('featureUrlAndToken', featureUrlAndToken);
-              const httpClient = new HttpClient(console);
-  
-              httpClient.sendGetHandleResponse(featureUrlAndToken, (chunk) => {
+                const featureUrlAndToken = featureUrl + '?token=' + encodeURIComponent(identityManager.token);
+                console.log('featureUrlAndToken', featureUrlAndToken);
+    
+                httpClient.sendGetHandleResponse(featureUrlAndToken, (chunk) => {
                   console.info('ArcGIS layer info response ' + chunk);
                   try {
                     const featureServiceResult = JSON.parse(chunk) as FeatureServiceResult;
@@ -188,8 +200,8 @@ const arcgisPluginHooks: InitPluginHook<typeof InjectedServices> = {
                   }
                 });
               } catch (err) {
-              res.status(500).json({ message: 'Could not get ArcGIS layer info', error: err });
-            }
+                res.status(500).json({ message: 'Could not get ArcGIS layer info', error: err });
+              }
           })
 
           return routes
diff --git a/plugins/arcgis/web-app/projects/main/src/lib/ArcGISConfig.ts b/plugins/arcgis/web-app/projects/main/src/lib/ArcGISConfig.ts
index be99ed10b..15194f081 100644
--- a/plugins/arcgis/web-app/projects/main/src/lib/ArcGISConfig.ts
+++ b/plugins/arcgis/web-app/projects/main/src/lib/ArcGISConfig.ts
@@ -11,7 +11,7 @@ export interface FeatureServiceConfig {
     /**
      * Access token
      */
-    token?: string
+    token?: string // TODO?: Perhaps move to the auth property?
 
     /**
      * Username and password for ArcGIS authentication
@@ -82,15 +82,27 @@ export interface FeatureLayerConfig {
  */
 export interface ArcGISAuthConfig {
 
+    // TODO?: May want to add authType property
+
     /**
      * The username for authentication.
      */
-    username: string
+    username?: string
 
     /**
      * The password for authentication.
      */
-    password: string
+    password?: string
+
+    /**
+     * The Client Id for OAuth
+     */
+    clientId?: string
+
+    /**
+     * The Client secret for OAuth
+     */
+    clientSecret?: string
 }
 
 /**
diff --git a/plugins/arcgis/web-app/projects/main/src/lib/arc-layer/arc-layer.component.html b/plugins/arcgis/web-app/projects/main/src/lib/arc-layer/arc-layer.component.html
index df469804c..c937d7e3e 100644
--- a/plugins/arcgis/web-app/projects/main/src/lib/arc-layer/arc-layer.component.html
+++ b/plugins/arcgis/web-app/projects/main/src/lib/arc-layer/arc-layer.component.html
@@ -8,6 +8,10 @@ <h2>Feature Layers</h2>
       <button mat-button mat-stroked-button color="primary" aria-label="Add ArcGIS feature layer"
         (click)="onAddLayer()">ADD FEATURE SERVICE</button>
     </div>
+    <div>
+      <button mat-button mat-stroked-button color="primary" aria-label="Sign in with OAuth"
+        (click)="onSignIn()">Sign in with OAuth</button>
+    </div>
     <div class="arcLayers" *ngIf="!config.featureServices.length">
       <div class="arcLayer">
         There are no ArcGIS feature services currently being synchronized.
@@ -70,7 +74,7 @@ <h3 matDialogTitle>Layers</h3>
   <mat-dialog-actions align="end">
     <button mat-button matDialogClose>CANCEL</button>
     <button [disabled]="isSaveDisabled()" mat-flat-button color="primary" matDialogClose
-      (click)="onAddLayerUrl(layerUrl.value, layerToken.value, layers)">SAVE</button>
+      (click)="onAddLayerUrl({ layerUrl: layerUrl.value, selectableLayers: layers, layerToken: layerToken.value })">SAVE</button>
   </mat-dialog-actions>
 </ng-template>
 <ng-template #deleteLayerDialog let-data>
diff --git a/plugins/arcgis/web-app/projects/main/src/lib/arc-layer/arc-layer.component.ts b/plugins/arcgis/web-app/projects/main/src/lib/arc-layer/arc-layer.component.ts
index 3d5b0d588..f523458f9 100644
--- a/plugins/arcgis/web-app/projects/main/src/lib/arc-layer/arc-layer.component.ts
+++ b/plugins/arcgis/web-app/projects/main/src/lib/arc-layer/arc-layer.component.ts
@@ -24,7 +24,7 @@ export class ArcLayerComponent implements OnInit {
   isLoading: boolean;
   currentUrl?: string;
   private timeoutId: number;
-
+  
   @ViewChild('addLayerDialog', { static: true })
   private addLayerTemplate: TemplateRef<unknown>
   @ViewChild('deleteLayerDialog', { static: true })
@@ -123,6 +123,20 @@ export class ArcLayerComponent implements OnInit {
     })
   }
 
+  onSignIn() {
+    this.arcService.authenticate().subscribe({
+      next(x) {
+        console.log('got value ' + JSON.stringify(x));
+      },
+      error(err) {
+        console.error('something wrong occurred: ' + err);
+      },
+      complete() {
+        console.log('done');
+      },
+    });
+  }
+
   onAddLayer() {
     this.currentUrl = undefined
     this.arcLayerControl.setValue('')
@@ -151,12 +165,6 @@ export class ArcLayerComponent implements OnInit {
     this.arcService.putArcConfig(this.config);
   }
 
-
-  // Define the overloads
-  onAddLayerUrl(layerUrl: string, layerToken: string, layers: ArcLayerSelectable[]): void;
-  onAddLayerUrl(layerUrl: string, username: string, password: string, layers: ArcLayerSelectable[]): void;
-
-  // Implement the function
   /**
    * Adds a new layer to the configuration if it does not already exist.
    * 
@@ -174,8 +182,17 @@ export class ArcLayerComponent implements OnInit {
    * 6. Updates the configuration and emits the change.
    * 7. Persists the updated configuration using `arcService`.
    */
-  onAddLayerUrl(layerUrl: string, arg2: string, arg3: string | ArcLayerSelectable[], arg4?: ArcLayerSelectable[]): void {
+  onAddLayerUrl(params: {
+    layerUrl: string,
+    selectableLayers: ArcLayerSelectable[],
+    layerToken?: string,
+    username?: string,
+    password?: string,
+    clientId?: string,
+    clientSecret?: string
+  }): void {
     let serviceConfigToEdit = null;
+    const { layerUrl, selectableLayers, layerToken, username, password, clientId, clientSecret } = params;
 
     // Search if the layer in config to edit
     for (const service of this.config.featureServices) {
@@ -183,34 +200,30 @@ export class ArcLayerComponent implements OnInit {
         serviceConfigToEdit = service;
       }
     }
-    // Determine if layers in 3rd or 4th argument
-    const layers = typeof arg3 === 'string' ? arg4 : arg3;
 
     // Add layer if it doesn't exist
     if (serviceConfigToEdit == null) {
       console.log('Adding layer ' + layerUrl);
-      let token: string | null = null;
 
       const featureLayer: FeatureServiceConfig = {
         url: layerUrl,
         token: undefined,
-        auth: {
-          username: '',
-          password: ''
-        },
+        auth: {},
         layers: []
       } as FeatureServiceConfig;
 
-      if (typeof arg3 === 'string') {
+      if (username) {
         // Handle username and password case
-        featureLayer.auth = { username: arg2, password: arg3 };
-      } else {
+        featureLayer.auth = { username, password };
+      } else if (clientId) {
+        featureLayer.auth = { clientId, clientSecret };
+      }else {
         // Handle token case
-        featureLayer.token = arg2;
+        featureLayer.token = layerToken;
       }
       
-      if (layers) {
-        for (const aLayer of layers) {
+      if (selectableLayers) {
+        for (const aLayer of selectableLayers) {
           if (aLayer.isSelected) {
             const layerConfig = {
               layer: aLayer.name,
@@ -229,8 +242,8 @@ export class ArcLayerComponent implements OnInit {
     } else { // Edit existing layer
       console.log('Saving edited layer ' + layerUrl)
       const editedLayers = [];
-      if (layers) {
-        for (const aLayer of layers) {
+      if (selectableLayers) {
+        for (const aLayer of selectableLayers) {
           if (aLayer.isSelected) {
             let layerConfig = null
             if (serviceConfigToEdit.layers != null) {
diff --git a/plugins/arcgis/web-app/projects/main/src/lib/arc.service.ts b/plugins/arcgis/web-app/projects/main/src/lib/arc.service.ts
index 7f1b1a41b..f940c2738 100644
--- a/plugins/arcgis/web-app/projects/main/src/lib/arc.service.ts
+++ b/plugins/arcgis/web-app/projects/main/src/lib/arc.service.ts
@@ -1,6 +1,6 @@
 import { HttpClient } from '@angular/common/http'
 import { Injectable } from '@angular/core'
-import { Observable } from 'rxjs'
+import { Observable, Subject } from 'rxjs'
 import { ArcGISPluginConfig } from './ArcGISPluginConfig'
 import { FeatureServiceResult } from './FeatureServiceResult'
 import { EventResult } from './EventsResult'
@@ -30,6 +30,29 @@ export class ArcService {
     return this.http.get<FeatureServiceResult>(`${baseUrl}/arcgisLayers?featureUrl=${featureUrl}`)
   }
 
+  authenticate(): Observable<any> {
+    let subject = new Subject<any>();
+
+    const url = `${baseUrl}/oauth/sign-in`;
+    const authWindow = window.open(url, "_blank");
+
+    function onMessage(event: any) {
+      window.removeEventListener('message', onMessage, false);
+
+      if (event.origin !== window.location.origin) {
+        return;
+      }
+
+      subject.next(event.data)
+
+      // authWindow?.close();
+    }
+
+    authWindow?.addEventListener('message', onMessage, false);
+
+    return subject.asObservable()
+  }
+
   fetchEvents() {
     return this.http.get<EventResult[]>(`${apiBaseUrl}/events?populate=false&projection={"name":true,"id":true}`)
   }