Changes to Create or update base price or fixed price

the request property basePrice became optional

the request property listPrice became optional

the request property markup became optional

the fixedPrices/items request property type changed from no type to object

the request property default value was removed

the basePrice request property default value 100 was removed

the costPrice request property default value 35 was removed

the listPrice request property default value 50 was removed

the markup request property default value 30 was removed

endpoint added