diff --git a/vibes_auth/docs/drf/viewsets.py b/vibes_auth/docs/drf/viewsets.py
index 0b74cd97..e8cead2b 100644
--- a/vibes_auth/docs/drf/viewsets.py
+++ b/vibes_auth/docs/drf/viewsets.py
@@ -14,6 +14,7 @@ from vibes_auth.serializers import (
 USER_SCHEMA = {
     "create": extend_schema(
         summary=_("create a new user"),
+        request=UserSerializer,
         responses={status.HTTP_201_CREATED: UserSerializer, **BASE_ERRORS},
     ),
     "retrieve": extend_schema(
diff --git a/vibes_auth/serializers.py b/vibes_auth/serializers.py
index 9f6f59cb..0541774f 100644
--- a/vibes_auth/serializers.py
+++ b/vibes_auth/serializers.py
@@ -94,6 +94,11 @@ class UserSerializer(ModelSerializer):
         return instance
 
     def validate(self, attrs):
+        if "attributes" in attrs:
+            if not isinstance(attrs["attributes"], dict):
+                raise ValidationError(_("attributes must be a dictionary"))
+            if attrs["attributes"].get("is_business") and not attrs["attributes"].get("business_identificator"):
+                raise ValidationError(_("business identificator is required when registering as a business"))
         if "password" in attrs:
             validate_password(attrs["password"])
             if not compare_digest(attrs["password"], attrs["confirm_password"]):