Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A hand pay is a condition where a slot machine cannot pay the patron in the typical manner, requiring the casino staff to pay the customer out manually. In casinos which use coin in, coin out systems, a hand pay may be caused by a coin jam, inadequate supply of coins in the machine's hopper to pay the requested amount, or other problem with the coin out mechanism. A hand pay can also be triggered when the win is large enough that the number of coins required to pay out the win would be excessive.