in pan-domain-auth-play/src/main/scala/com/gu/pandomainauth/action/Actions.scala [191:196]
def readCookie(request: RequestHeader): Option[PandomainCookie] = {
request.cookies.get(settings.cookieSettings.cookieName).map { cookie =>
val forceExpiry = request.cookies.get(FORCE_EXPIRY_KEY).exists(_.value != "0")
PandomainCookie(cookie, forceExpiry)
}
}