Not really a WordPress question, but I’ll bite.
That data is JSON. To manipulate it with PHP you need to decode it with json_decode(). Then you can treat it as a PHP object.
So to access the values you’d mention, and assuming the JSON is in a variable named $json:
$object = json_decode( $json );
$staff_name = $object->items[0]->staff_name;
$coupon = $object->coupon;
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