get Fetcher
Get an inbox fetcher based on the current installation ID. Batch must be started for all of the fetcher's features to work, but you can call this method before starting Batch (such as in your activity's onCreate)
Return
an instance of BatchInboxFetcher with the wanted configuration
Parameters
A valid context. Note that the fetcher will hold on to it during its lifetime, so the application context might be more appropriate depending on your usage.
Get an inbox fetcher for the specified user identifier. Batch must be started for all of the fetcher's features to work, but you can call this method before starting Batch (such as in your activity's onCreate)
Return
an instance of BatchInboxFetcher with the wanted configuration
Parameters
A valid context. Note that the fetcher will hold on to it during its lifetime, so the application context might be more appropriate depending on your usage.
User identifier for which you want the notifications
Secret authentication key: it should be computed your backend and given to this method