[2026-09-08 10:10:06] local.INFO: Billing portal opened {"user_id":12,"stripe_id":"cus_VAmHiqbx6cmUOn"} 
[2026-09-08 10:10:34] local.ERROR: Checkout session failed {"user_id":7,"stripe_id":"cus_VDnaEf7QFQjBxx","auto_renew":false,"stripe_error":"Received unknown parameter: subscription_data[cancel_at]"}