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Just as before echo $arr['OrderAddresses'][0]['ConsignmentNo']; //--> 547645363546 "- >" is for object properties not array keys

<?php $jsn = '[{"OrgID":"1234567890987654321","OrderNumber":"M123456","OrigOrderNumber":"","Placed":"2022-08-17T14:04:47.653","PostCode":"AB1 2CD","BackOfficeOrderNumber":"12345678","CustomerName":"My Name","OutletName":"My Name Two","OrderStatus":"Delivered","OrderRef":"O-0012345678","AddressCount":1}]'; //convert to an array $arr = json_decode($jsn, 1); // output the array to view structure echo '<pre>' . print_r($arr, 1) . '</pre>'; ?> The resulting array is and you then access you required value by following the array keys (indicated), so you want $order_number = $arr[0]['OrderNumber'];

You find that out with a process commonly known as "testing" (You might want to Google that)