diff --git a/package-lock.json b/package-lock.json
index 4569f488..792d0db8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -35,7 +35,7 @@
         "@vue/vue3-jest": "^27.0.0-alpha.1",
         "axios-mock-adapter": "^1.21.5",
         "babel-jest": "^27.0.6",
-        "eslint": "8.45.0",
+        "eslint": "^8.45.0",
         "eslint-config-airbnb-base": "15.0.0",
         "eslint-import-resolver-alias": "1.1.2",
         "eslint-plugin-import": "2.26.0",
diff --git a/package.json b/package.json
index dbbcf42e..9b22634b 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
     "@vue/vue3-jest": "^27.0.0-alpha.1",
     "axios-mock-adapter": "^1.21.5",
     "babel-jest": "^27.0.6",
-    "eslint": "8.45.0",
+    "eslint": "^8.45.0",
     "eslint-config-airbnb-base": "15.0.0",
     "eslint-import-resolver-alias": "1.1.2",
     "eslint-plugin-import": "2.26.0",
diff --git a/src/constants/endpoints.js b/src/constants/endpoints.js
index 610b5273..d91b5026 100644
--- a/src/constants/endpoints.js
+++ b/src/constants/endpoints.js
@@ -126,6 +126,10 @@ const endpoints = Object.freeze({
         url: '/clientauth/api/v1/clientauth/validate-client-tag',
         method: 'GET'
     },
+    ValidateClientSignature: {
+        url: '/clientauth/api/v1/clientauth/validate-client-signature',
+        method: 'POST'
+    },
     IsVinbyAddressPermissible: {
         url: '/vehicle/api/v1/vehicle/is-vin-by-address-permissible',
         method: 'Get'
diff --git a/src/helpers/clientauth-helper.js b/src/helpers/clientauth-helper.js
index 2bfd53bb..308ec22b 100644
--- a/src/helpers/clientauth-helper.js
+++ b/src/helpers/clientauth-helper.js
@@ -1,6 +1,6 @@
 import { useMainStore } from '@/store';
 
-const validateISSClientTag = (clientTag) => {
+export function validateISSClientTag(clientTag) {
     const store = useMainStore();
 
     return store.validateClientTag(clientTag)
@@ -8,6 +8,14 @@ const validateISSClientTag = (clientTag) => {
             (response) => response,
             () => null
         );
-};
+}
 
-export default validateISSClientTag;
+export function validateISSClientSignature(clientTag, token, signature) {
+    const store = useMainStore();
+
+    return store.validateClientSignature(clientTag, token, signature)
+        .then(
+            (response) => response,
+            () => null
+        );
+}
diff --git a/src/layouts/entry-page/entry-page.vue b/src/layouts/entry-page/entry-page.vue
index 7a50e3a9..cb1538e3 100644
--- a/src/layouts/entry-page/entry-page.vue
+++ b/src/layouts/entry-page/entry-page.vue
@@ -9,7 +9,7 @@
 <script>
 // Supporting files
 import issPageValues from '@/router/router-constants/issPage-values';
-import validateISSClientTag from '@/helpers/clientauth-helper';
+import { validateISSClientTag, validateISSClientSignature } from '@/helpers/clientauth-helper';
 import { useMainStore } from '@/store';
 
 export default {
@@ -60,7 +60,7 @@ export default {
                     const resp = await validateISSClientTag(clientTag);
 
                     if (resp?.data.active && resp?.data.accountName.length > 0) {
-                        this.populateISSConfigValues(resp.data);
+                        await this.populateISSConfigValues(resp.data, clientTag, queryStringParams.token, queryStringParams.signature);
 
                         authorized = true;
 
@@ -78,7 +78,7 @@ export default {
                     window.location = `/?issPage=${issPageValues.WELCOME_PAGE}`;
                 }
             },
-            populateISSConfigValues(data) {
+            async populateISSConfigValues(data, clientTag, token, signature) {
                 this.mainStore.issConfig.clientName = data.accountName;
                 this.mainStore.issConfig.clientDisplayName = data.accountName; // Defaults to use the client name.
                 this.mainStore.issConfig.accountNumber = data.accountNumber;
@@ -87,7 +87,11 @@ export default {
 
                 // NOTE: This is only here for testing purposes.
                 // Will be removed and replaced by actual token / signature validation when work is completed.
-                if (data.authentication === 'RSAToken') this.mainStore.issConfig.isAuthenticated = true;
+                if (data.authentication === 'RSAToken') {
+                    const resp = await validateISSClientSignature(clientTag, token, signature);
+                    console.log(resp.data);
+                    this.mainStore.issConfig.isAuthenticated = resp?.valid ?? false;
+                }
 
                 try {
                     if (data.clientFlags) {
diff --git a/src/store/index.js b/src/store/index.js
index 38f6550d..5d9d68f1 100644
--- a/src/store/index.js
+++ b/src/store/index.js
@@ -1518,11 +1518,26 @@ export const useMainStore = defineStore({
 
         async validateClientTag(clientTag) {
             return await globalMethods.callHttpClient({
-                methods: endpoints.ValidateClientTag.method,
+                method: endpoints.ValidateClientTag.method,
                 endpoint: `${endpoints.ValidateClientTag.url}/${clientTag}`
             });
         },
 
+        async validateClientSignature(clientTag, token, signature) {
+
+            const payload = {
+                clientTag,
+                token,
+                signature
+            };
+
+            return await globalMethods.callHttpClient({
+                method: endpoints.ValidateClientSignature.method,
+                endpoint: endpoints.ValidateClientSignature.url,
+                payload
+        });
+        },
+
         saveServiceLocation(serviceLocationInfo) {
             if (this.order.serviceLocation) {
                 if (