payemnt billing and credits refactoring

backend/igny8_core/auth/serializers.py

@@ -41,6 +41,11 @@ class AccountSerializer(serializers.ModelSerializer):
     plan = PlanSerializer(read_only=True)
     plan_id = serializers.PrimaryKeyRelatedField(queryset=Plan.objects.filter(is_active=True), write_only=True, source='plan', required=False)
     subscription = SubscriptionSerializer(read_only=True, allow_null=True)
+    total_credits = serializers.SerializerMethodField()
+    
+    def get_total_credits(self, obj):
+        """Return total available credits (plan + bonus)."""
+        return obj.credits + obj.bonus_credits
     
     def validate_plan_id(self, value):
         """Validate plan_id is provided during creation."""
@@ -52,7 +57,7 @@ class AccountSerializer(serializers.ModelSerializer):
         model = Account
         fields = [
             'id', 'name', 'slug', 'owner', 'plan', 'plan_id',
-            'credits', 'status', 'payment_method',
+            'credits', 'bonus_credits', 'total_credits', 'status', 'payment_method',
             'subscription', 'billing_country',
             'account_timezone', 'timezone_mode', 'timezone_offset',
             'created_at'