diff --git a/server/index.js b/server/index.js
index 4fb7abf..7442cad 100644
--- a/server/index.js
+++ b/server/index.js
@@ -1321,7 +1321,8 @@ const server = http.createServer(async (req, res) => {
             const rawEmail = o.client_reference_id || o.customer_email || o.metadata?.email || '';
             const email = typeof rawEmail === 'string' ? rawEmail.trim().toLowerCase() : '';
             const rawPlanId = o.metadata?.planId;
-            const planId = typeof rawPlanId === 'string' && rawPlanId.trim() ? rawPlanId.trim() : 'pro';
+            const candidatePlan = typeof rawPlanId === 'string' ? rawPlanId.trim() : '';
+            const planId = ['pro', 'kurumsal'].includes(candidatePlan) ? candidatePlan : 'pro';
             if (email) {
               store.setPlan(email, {
                 plan: planId, kaynak: 'stripe',