Changes to Retrieve Fulfillments

the response property carrier became nullable for the status 200

the response property created_at became nullable for the status 200

the response property field_mappings became nullable for the status 200

the response property id became nullable for the status 200

the response property items became nullable for the status 200

the response property modified_at became nullable for the status 200

the response property order_id became nullable for the status 200

the response property remote_data became nullable for the status 200

the response property remote_id became nullable for the status 200

the response property tracking_numbers became nullable for the status 200

the response property tracking_urls became nullable for the status 200

endpoint added