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What is a callback, and when would you use it?
I'm a little confused on what callbacks are. I don't know what the purpose of them. Is this method of coding much more efficient?
EDIT: I'm mostly asking this because I want to learn how to use DevProducts, and then this came along..
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A callback is similar to an event, but generally there can only be one function associated with the action. In the case with ProcessReceipt, you set a function to that property of the service and then that function is the callback. If you set another function to that property, the old one will be replaced.