date_range of the request
$url = "https://api.ebay.com/sell/analytics/v1/traffic_report?dimension=LISTING&filter=" . urlencode("listing_ids:{" . $listingIdStr . "},date_range:[" . $starDate . ".." . $endDate . "]") . "&metric=LISTING_IMPRESSION_TOTAL,LISTING_VIEWS_TOTAL,SALES_CONVERSION_RATE";
$starDate=2018-04-23 $endDate=2018-04-24
But this data request 2018-04-17
Sorry for the delay in response.
Be sure to URL-encode the value for the filter query parameter. See: https://developer.ebay.com/api-docs/sell/analytics/resources/traffic_report/methods/getTrafficReport#uri.filter
HTH,
