Provides a list of the authenticated user's contacts. Sync tokens expire 7 days after the full
sync. A request with an expired sync token will result in a 410 error. In the case of such an
error clients should make a full sync request without a `sync_token`. The first page of a full
sync request has an additional quota. If the quota is exceeded, a 429 error will be returned.
This quota is fixed and can not be increased. When the `sync_token` is specified, resources
deleted since the last sync will be returned as a person with `PersonMetadata.deleted` set to
true. When the `page_token` or `sync_token` is specified, all other request parameters must match
the first call. Writes may have a propagation delay of several minutes for sync requests.
Incremental syncs are not intended for read-after-write use cases. See example usage at [List the
user's contacts that have
changed](/people/v1/contacts#list_the_users_contacts_that_have_changed).
Create a request for the method "connections.list".
This request holds the parameters needed by the people server. After setting any optional
parameters, call the
AbstractGoogleClientRequest.execute() method to invoke the remote operation.