The pricing scheme details.
fixed_priceobject<money>Optionalcurrency_codestring<currency_code>RequiredvaluestringRequiredtiersobject<pricing_tier>[]Optionalamountobject<money>Requiredcurrency_codestring<currency_code>RequiredvaluestringRequiredcreate_timestring<date_time>Optionalupdate_timestring<date_time>Optional