We have identified the root cause and applied a quick fix, with a permanent solution to be implemented in the next 24 hours. Users should be able to go through with their orders now. We'll be monitoring the situation until it's resolved.

We are aware of the issues a subset of our users is facing when accepting invites and / or completing orders. Our team is working on the problem, and currently investigating a possible cause. We'll update this thread as we go through the problem.