added login logic excl refresh call

backend/src/main/java/com/vaessl/app/dto/ConnectionResponse.java

@@ -1,6 +1,17 @@
 package com.vaessl.app.dto;
 
 import java.time.Instant;
+import java.util.Map;
 
-public record ConnectionResponse(String token, String attachmentToken, Instant expiresAt) {
+public record ConnectionResponse(String token, Instant expiresAt, Map<String, Object> extraResponseData) {
+    
+    public String getExtraVar(String key) {
+        if(extraResponseData == null) {
+            return null;
+        } else {
+            Object value = extraResponseData.get(key);
+
+            return value != null ? String.valueOf(value) : null;
+        }
+    }
 }