Create markup configuration for a merchant by product and payment method.
payin, payoutpix, billet, credit_cardglobal is supported externally.fixed: fixed amount per chargepercent: percentage over the charge amount0.01.percent.Business rules:mode = percentmode = fixed0.01percent.Business rules:min_charge_valuemode = fixedglobal.fixed or percent.mode is percent.mode is percent.