Optional
aInstancePtr: objectA run time mechanism for interface discovery.
NS_OK if the interface is supported by the associated instance, NS_NOINTERFACE if it is not.
aInstancePtr must not be null.
[in] A requested interface IID
[out] A pointer to an interface pointer to receive the result.
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Called by methods that return a push subscription. A non-success |status| indicates that there was a problem returning the subscription, and the |subscription| argument should be ignored. Otherwise, |subscription| will point to a valid push subscription, or |null| if the subscription does not exist.