Sets callback as a function to be executed any time the value associated with key is changed. It is important to disconnect the connection when the subscription to the key is no longer needed.

Returns the value of the entry in the DataStore with the given key

Increments the value of a particular key amd returns the incremented value

Sets the value of the key. This overwrites any existing data stored in the key

Retrieves the value of the key from the website, and updates it with a new value. The callback until the value fetched matches the value on the web. Returning nil means it will not save.