Registers a function to call when a chat visitor cancels a chat request. Available in API version 29.0 or
later.
Arguments
| callback |
function |
JavaScript method called upon completion of the method. |
Response
This method is asynchronous so it returns its response in an object
in a callback method. The response object contains the following properties:
| chatKey |
string |
The chat key for the chat request that has been canceled. |
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