If a registered user who is not logged in attempts to subscribe via a subscription link to the /offers page, and then follows the journey to the checkout page, on the first attempt they are redirected back to the /offers page from /checkout after they have logged in.
They subsequently follow the same journey again and this time they are correctly taken to the /payment page as they are already logged in when they access the /offers page.
We understand from a ticket that that the reason for this is that ARC doesn’t have any APIs that can transfer an anonymous cart to a user who logs in during the flow. The cart created when the user was anonymous is not being reflected
Thank you Aschel for adding this suggestion! I agree that this is important to reduce friction during the checkout process.