abort method
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Aborts a PaymentRequest. The abort() method can only be called after the show() method has been called and up until the point where the promise is resolved.
Syntax
PaymentRequest.abort();
Parameters
This method has no parameters.
Return value
This method does not return a value.
Remarks
A web page my choose to abort, for example, if the suer did not complete the transaction in the required amount of time.