update

AllPay_Integration_Specification_EN.md

@@ -320,8 +320,6 @@ String "OK"
 | GWTime    | String(14) | Yes    | yyyyMMddHHmmss this should be a GWtime, currently is local transaction time |
 | signType  | String(10) | Yes    | "SHA256" |
 | signature | String(32) | Yes    | signature |
-| returnAmount  | String(12) | Yes    | Refund amount |
-| orderCurrency | String(3)  | Yes    | Currency of the order |
 
 **5. Refund result notification - callback**