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When you return the money on the e-wallet, the refund amount shouldn't exceed the current day balance of the merchant on the corresponding e-wallet (the total amount of successful payments minus the commission of the bank, minus the total amount of successful returns). Partial cancellations on e-wallets are prohibited during the calendar day (according to the time zone of Moscow).

Performing WebMoney payment cancellations via web-service have additional feature: system replay contain the operation status «In Process» (responsecode=AS300). It is related to the delay of the status return from the WebMoney payment system. To receive the real status you should perform an additional request for the order operations statuses in a few minutes later the cancel request.

When several cancels are performed on the order then several cancel operations (type 300: cancel) will be returned with the request result. They will have different parameter billnumber (in extended format: 5700027202722028.3 – for example).