Changes to Update a line item

added the optional property data/relationships/attachments to the response with the 200 status

request property data/type was restricted to a list of enum values

added the new optional request property data/attributes/_add_tags

added the new optional request property data/attributes/_external_price

added the new optional request property data/attributes/_remove_tags

added the new optional request property data/attributes/_reserve_stock

added the new optional request property data/attributes/_reset_circuit

added the new optional request property data/attributes/_reset_restocked_quantity

added the new optional request property data/attributes/compare_at_amount_cents

added the new optional request property data/attributes/frequency

added the new optional request property data/attributes/options_amount_cents

added the new optional request property data/attributes/unit_amount_cents

added the new optional request property data/relationships/tags

the request property data/attributes/bundle_code became nullable

the request property data/attributes/image_url became nullable

the request property data/attributes/metadata became nullable

the request property data/attributes/name became nullable

the request property data/attributes/reference became nullable

the request property data/attributes/reference_origin became nullable

the request property data/attributes/sku_code became nullable

the type request property default value line_items was removed

added the new line_items enum value to the request property data/type

added the media type application/vnd.api+json for the response with the status 200