diff --git a/supabase/functions/create-checkout/index.ts b/supabase/functions/create-checkout/index.ts
index 43f7782..c204b28 100644
--- a/supabase/functions/create-checkout/index.ts
+++ b/supabase/functions/create-checkout/index.ts
@@ -100,9 +100,9 @@ const BodySchema = z.object({
   company: z.string().trim().min(1).max(200),
   email: z.string().trim().email().max(255),
   phone: z.string().trim().max(30).optional().default(""),
-  address: z.string().trim().max(200).optional().default(""),
+  address: z.string().trim().min(1).max(200),
   postal_code: z.string().trim().min(1).max(20),
-  city: z.string().trim().max(100).optional().default(""),
+  city: z.string().trim().min(1).max(100),
   comments: z.string().trim().max(1000).optional().default(""),
   return_url: z.string().url(),
   environment: z.enum(["sandbox", "live"]),