Changes to Fulfill a listing using a different token

the response property transactions/items/to became nullable for the status 200

the response property transactions/items/value became nullable for the status 200

the response property transactions/items/value_hex became nullable for the status 200

the request property recipient became nullable

added the optional property code to the response with the 401 status

added the optional property code to the response with the 403 status

added the optional property code to the response with the 404 status

added the optional property code to the response with the 409 status

added the optional property transactions/items/gas_limit to the response with the 200 status

added the optional property transactions/items/svm to the response with the 200 status