in client/src/main/scala/com.gu.contentapi.client/Parameters.scala [26:33]
def withParameters(parameterMap: Map[String, Parameter]): Owner
def has(param: String) = parameterHolder.contains(param)
protected def parameterHolder: Map[String, Parameter]
def parameters: Map[String, String] =
parameterHolder.mapValues(_.value).toMap.collect { case (k, Some(v)) => (k, v.toString) }