Order approve page not work - Rest API v2

[ptt_dev04]

I am use the Rest Api v2 for create order.

I create the order with success, but after acess the aprove link by browser, i can do login and click continue but in end it show message error: "We are sorry
Everything indicates that the system is not working at the moment."

Someone can help me on this situation.

I am use sandbox url.

[rahul-dighe · Accepted solution]

are you using our Client SDK  to launch the buyer approval flow?

if you are just calling the API directly without using the Client SDK - you will have to pass the return_url and cancel_url in application_context - that is probably the most likely cause of your issue