- c# - What is a callback? - Stack Overflow
A callback can be implemented as a delegate to a method, but you could equally say that passing an object that supports a callback method on its interface is a callback
- What is a callback URL in relation to an API? - Stack Overflow
The callback URL is like that return envelope You are basically saying, "I am sending you this data; once you are done with it, I am listening on this callback URL waiting your response " So the API will process the data you have sent then look at the callback to send you the response
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