Changes to Create a price

added the new required request property data/relationships/price_list/data

added the new required request property data/relationships/sku/data

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

the request property data/relationships/sku became required

removed the request property data/relationships/price_list/id

removed the request property data/relationships/price_list/type

removed the request property data/relationships/sku/id

removed the request property data/relationships/sku/type

added the new optional request property data/attributes/rules

added the new optional request property data/relationships/price_tiers

the request property data/attributes/compare_at_amount_cents became optional

the type request property default value prices was removed

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

added the media type application/vnd.api+json for the response with the status 201