I am facing an issue checking out orders from my development store. After some digging around. I realize that it may be because the trial number of checkouts may have exceeded what was provisioned for the development store.
Included are some threads in which I found similar issues and all pointed to seeking help from Shopify support members.
Thank you for sharing those related threads for reference! In this situation you will need to contact partner support through the support tab in your partner dash to request a review. Our partner team will have a look at the dev store and see if the restriction can be lifted for you.