Hey Chao,
I believe that the behaviour was due to an internal server error that you were facing. From the conversations you had with my team, I got to know that the issue has now been resolved. Please write to support@chargebee.com if you have any queries.
ChaoLiu
Hi there,
I am testing integration with Chargebee. This error occurred to me:

The browser console sayshttps://camect-test.chargebee.com/api/v2/customers/XXXX/cart_sub_create_for_customer?hp_token=YYYY 500 (Internal Server Error)
The same code works for me before Friday(maybe). I have several plans. This error only happens when I subscribe to one of the plan. The other plans work well.
Could anybody help me?