Changes to Modify an existing Product Variant.

the request property variant/options/items/name became required

the request property variant/options/items/value became required

the response property variant/compare_at_price became nullable for the status 200

the response property variant/cost_per_item became nullable for the status 200

the response property variant/options/items/custom became nullable for the status 200

removed the request property variant/options/items/product_option_position

removed the request property variant/options/items/product_value_position

added the new optional query request parameter fields

added the new optional request property variant/weight

the option_type request property default value option was added

the barcode request property default value 123456 was removed

the stock request property default value 100 was removed

added the optional property variant/discount to the response with the 200 status

added the optional property variant/options/items/product_option_id to the response with the 200 status

added the optional property variant/options/items/product_option_value_id to the response with the 200 status

added the optional property variant/position to the response with the 200 status

added the optional property variant/weight to the response with the 200 status

added the optional property variant/created_at to the response with the 200 status

added the optional property variant/updated_at to the response with the 200 status