You should not be using vBulletin 4 (or vBulletin in general) in 2025. Mobile browsing is the most common form of internet browsing in 2025, and vB4 will never be as good as XenForo when it comes to responsive design.
I would strongly recommend you switch to XenForo if you're setting up a new...
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This means that you have configured some of your credits to expire, but certain users do not have enough credits to deduct.
I'm honestly not sure what the correct course of action is here. What would you expect to happen if a user does not have enough credits to "pay" for the expiry?
Sorry, but no, this is unlikely to change. Moderation should not be enabled for that kind of event, since it is dealing with real money and your payment processor should already have checked for fraud.
At the moment, you would need to modify dbtech_ecommerce_address_edit_macros and add hint="{{ phrase('required') }}" required="true" to the various boxes.
For the phrases, you can edit these phrases:
dbtech_ecommerce_address_address1
dbtech_ecommerce_address_address2...