In the context of the increasing spread of online trading, it has become increasingly common to combine the delivery of goods or services with vouchers (3) transmitted digitally or in paper form for further purchases. These vouchers (3) are usually added to the deliveries of goods by third-party companies, which receive vouchers from the companies participating in the respective voucher program if vouchers are redeemed. In connection with the redemption of vouchers (3) in shops of the participating companies, the problem arises in connection with the settlement of the commissions that the participating companies refuse access to their cash register data for understandable reasons. For this purpose, the invention proposes a mobile application software that is installed on a mobile data processing unit (2) and is primarily able to log the redemption process of one or more vouchers (3) in such a way that at least the location, date and time the voucher redemption is logged in connection with the identifier of the redeemed voucher (3) and the commission can then be billed using this data without access to the cash register data of the participating company.
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