Hi Spike
I've just tried on our HSNM to do some payments with Payment Express but I haven't any duplicate entry on sales export
HsUserTransactionsID;TransactionType;TransactionDescr;GatewayID;PaymentDate;Currency;CostCurrency;Reseller;Manager;DomainName;UserName;LastName;FirstName;EMailAddress;ProductCost;ManagerCostPrice;SellPrice;ProductDescr;HsProductID;ReassignExpirationAtLogin;Expiration
"54945";"0";"Cash";"";"2017-03-16 09:48:39";"EUR";"EUR";"COMUNE DI ROMA";"Centro Nuoto Aurelia";"PiscinaAurelia";"[email=magnini@PiscinaAurelia";"";"";"";"5";"0.00";"5.00";"5]magnini@PiscinaAurelia";"";"";"";"5";"0.00";"5.00";"5[/email] Ore di connessione";"93";"0";"2030-12-31 00:00:00"
"56997";"11";"PaymentExpress";"TQR8GRW6WGBJWSNQ";"2017-07-18 08:59:00";"EUR";"EUR";"COMUNE DI ROMA";"Centro Nuoto Aurelia";"PiscinaAurelia";"[email=mimmmo@PiscinaAurelia";"Capra";"Mimmo";"";"2";"0.00";"2.00";"2]mimmmo@PiscinaAurelia";"Capra";"Mimmo";"";"2";"0.00";"2.00";"2[/email] Ore di connessione";"101";"1";"2030-12-31 00:00:00"
"57001";"11";"PaymentExpress";"RZGJ6YV9QHQ4MB55";"2017-07-18 09:00:20";"EUR";"EUR";"COMUNE DI ROMA";"Centro Nuoto Aurelia";"PiscinaAurelia";"[email=mario.rossi@PiscinaAurelia";"Rossi";"Mario";"";"5";"0.00";"5.00";"5]mario.rossi@PiscinaAurelia";"Rossi";"Mario";"";"5";"0.00";"5.00";"5[/email] Ore di connessione";"93";"1";"2030-12-31 00:00:00"
Also, if I decline a PaymentExpress payments, I only see one error on the System Log
SystemLog.jpg
Are you using the latest version? Can you tell us more informations in order to replicate the problem in our lab? Is the error random or does it always happen?
Thanks
Best regards