Hi,
I created the one website with 2 language layers(Japan and China) and used Braintree Payment Gateway (attached file for your reference).
I made an order in Japan layer and Braintree Payment Gateway return error , show error page in main site (singapore). Kindly check the below loom video
https://www.useloom.com/share/93e59b998e474b17a96395cd60294a82
Kindly help me to check what is the problem.
Thanks and Regards,
Tin ma MA