code/modules/supply/supply_packs/pack_abstract.dm 
| /datum/supply_packs/abstract | Abstract supply packs that don't contain any goods, but instead represent purchases that cargo can make. A supply pack that does not contain physical objects, but instead fires some sort of callback when ordered. |
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| /datum/supply_packs/abstract/admin_notify | A sample supply pack that notifies admins when it is purchased, but provides no items. |