Type	Topic	Plugin	Version	macOS	Windows	Linux	Console & Web	iOS
class	CloudKit	MBS Mac64bit Plugin	16.5	Yes	No	No	Yes, macOS only	No

Function: A CKFetchSubscriptionsOperation object retrieves CKSubscription objects (whose IDs you already know) from iCloud and can fetch all subscriptions associated with the current user.
Notes:
You might fetch subscription objects so you can examine or modify their parameters; for example, to adjust the delivery options for push notifications generated by the subscription.

The completion event is called after the operation executes and returns its results to you. You can use a completion block to perform housekeeping chores related to the operation, but do not use it to process the results of the operation itself. Any completion block you specify should be prepared to handle the failure of the operation to complete its task, whether due to an error or an explicit cancellation.
Subclass of the CKDatabaseOperationMBS class.

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