Ported Animus Station's currency system, credit to @EditorRUS. ATM's now require a pin which is generated and stored in mob notes. Space cash renamed to stack of credits, and same value credits can be stacked together. Credits are generated randomly between 500 to 2000 credits. Credits or coins can be inserted and converted to credits. Still not used for anything!

code/game/objects/items/weapons/cards_ids.dm

@@ -107,6 +107,12 @@ FINGERPRINT CARD
 	else
 		..()
 
+/obj/item/weapon/card/id/proc/checkaccess(p,var/mob/user)
+	if(p == pin)
+		user << "\green Access granted"
+		return 1
+	user << "\red Access denied"
+	return 0
 
 // FINGERPRINT HOLDER