feat: add support for frontend v2

ref: UUI-1468

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@schibsted/account-sdk-browser",
-  "version": "5.0.1",
+  "version": "5.0.2",
   "description": "Schibsted account SDK for browsers",
   "main": "index.js",
   "type": "module",

src/identity.js

@@ -866,7 +866,8 @@ export class Identity extends EventEmitter {
         maxAge = '',
         locale = '',
         oneStepLogin = false,
-        prompt = 'select_account'
+        prompt = 'select_account',
+        frontendVersion
     }) {
         this._closePopup();
         this.sessionStorageCache.delete(HAS_SESSION_CACHE_KEY);
@@ -881,7 +882,8 @@ export class Identity extends EventEmitter {
             maxAge,
             locale,
             oneStepLogin,
-            prompt
+            prompt,
+            frontendVersion
         });
 
         if (preferPopup) {
@@ -952,6 +954,7 @@ export class Identity extends EventEmitter {
         locale = '',
         oneStepLogin = false,
         prompt = 'select_account',
+        frontendVersion,
     }) {
         if (typeof arguments[0] !== 'object') {
             // backward compatibility
@@ -972,7 +975,7 @@ export class Identity extends EventEmitter {
         assert(isNonEmptyString(state),
             `the state parameter should be a non empty string but it is ${state}`);
 
-        return this._oauthService.makeUrl('oauth/authorize', {
+        const queryParams = {
             response_type: 'code',
             redirect_uri: redirectUri,
             scope,
@@ -984,8 +987,15 @@ export class Identity extends EventEmitter {
             max_age: maxAge,
             locale,
             one_step_login: oneStepLogin || '',
-            prompt: acrValues ? '' : prompt
-        });
+            prompt: acrValues ? '' : prompt,
+        }
+
+        if(frontendVersion){
+            assert(isStrIn(frontendVersion, ['v2']), 'the frontendVersion parameter must be a valid version');
+            queryParams.frontendVersion = frontendVersion
+        }
+
+        return this._oauthService.makeUrl('oauth/authorize', queryParams);
     }
 
     /**