Issue: Some fields should not be NULL in openedx/ecommerce

Development
2

Apologies for the delay, I was just alerted to your post, thank you for finding these, they do look like missing constraints. For most Open edX projects PRs are a great way to contribute, however we are in the process of deprecating this ecommerce service and will only be applying critical security fixes while we build the replacement; you can learn more about that process and the new system in this post. Thank you again, and we would love your input and contributions to all parts of Open edX.