add
fun add(participant: Contact, onCompletion: (SippoResourceError?) -> Unit)
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Adds a new participant to this group. Note: The user needs to be the group's owner.
Parameters
participant
User to be added.
on Completion
Callback that will be invoked when the request is completed. It will receive a SippoResourceError if any error occurs. In case of success, error will be null.