Buying from shop when worldserver is down

Currently it's possible to buy from the shop while the worldserver is down.

Using mycred -- this means that the user is charged, but never recieves the item.

Would it be possible to only allow purchases when the worldserver is up?

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No file, test, or entry point is named. Start by tracing the shop purchase flow and the mycred charge, then determine how worldserver availability can be checked before charging; done means purchases are prevented while it is down and users are not charged without receiving the item.

Written by the indexing model from the issue text.