Retrieve users who have already registered from your address book.
Retrieve compact list of registered users
1. Set a device identifier
udid
parameter to specify a user’s device. If specified, contacts will be returned for a specified device only.2. Specify if you want to get a compact list with contacts
compact
parameter as 1
to get a compact list of contacts.3. As a result, the API returns a list of users' IDs and phone numbers.
force=1
to apply, then all previous contacts for the device context
will be replaced by new ones.200
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