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The field <slipno> is used only for processings: UCS, Raiffeisenbank, Multicard and Russian Standard. The values of this parameter in result requests are described in the table "Values of <slipno> parameter". If payment confirmation will not be sent (charge service was not called), the financial transaction is not sent to the processing and such transaction will not appear in the processing report for enterprise.
An example of a result request in XML format which returned an error (wrong password):