Hi @melrogan, @davidpmccormick,
Sorry for the delay, I think the confusion here is related to next js (I’m not intimately familiar with the framework.)
I suspect this issue is because you are making a post from your backend, and it doesn’t include the cookies needed in the request. Stated in this doc: 401 Unauthorized error when calling /continue endpoint after a redirect from the rules
I am able to make a POST to the /continue endpoint and continue my transaction. here is an example: