lib/service/mapToService.js
function mapToService () {
  return ({ request, requestMapper, mappings }) => {
    const data = mapData(request.data, request, mappings)
    return {
      ...request,
      data: applyEndpointMapper(data, request, requestMapper)
    }
  }
}
function mapToService () {
  return ({ request, requestMapper, mappings }) => {
    const data = mapData(request.data, request, mappings)
    return {
      ...request,
      data: applyEndpointMapper(data, request, requestMapper)
    }
  }
}
Map the data coming _from_ the service. Everything is handled by the mappings,
but this method make sure that the right types are mapped.

@param {Object} data - The data to map
@param {Object} mappings - The mappings to map with
@returns {Object} Mapped data