`GetAuthenticatedChannelRequest` returns the contact received in a request if one exists for the given userID. Returns an error if no contact is found.
`GetBackup` returns a pointer to the backup container so that the backup can be set and triggered.
### func (*Client) GetComms
```go
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@@ -471,6 +479,15 @@ func (c *Client) RequestAuthenticatedChannel(recipient, me contact.Contact,
`RequestAuthenticatedChannel` sends a request to another party to establish an authenticated channel. It will not run if the network state is not healthy. An error will be returned if a channel already exists or if a request was already received. When a confirmation occurs, the channel will be created and the callback will be called. Can be retried.