Hi,
I have the same issue with staging credential
request
{"language":"es","command":"SUBMIT_TRANSACTION","merchant":{"apiLogin":"11959c415b33d0c","apiKey":"6u39nqhq8ftd0hlvnjfs66eh8c"},"test":true,"transaction":{"paymentCountry":"CO","order":{"accountId":"500538","referenceCode":"NEXWAY1428657558","description":"NEXWAY DOWNLOAD(test)","language":"es","additionalValues":{"TX_VALUE":{"value":"10000","currency":"COP"}},"buyer":{"emailAddress":"Doe....@test.com"}},"ipAddress":"192.168.201.85","cookie":"cookie_0.38408400 1428657559","userAgent":"PayU SDK 4.0.1","source":"PAYU_SDK","creditCard":{"name":"APPROVED","number":"4111111111111111","expirationDate":"2016\/10","securityCode":"111","processWithoutCvv2":false},"extraParameters":{"INSTALLMENTS_NUMBER":1},"paymentMethod":"VISA","payer":{"fullName":"APPROVED","emailAddress":"buyer...@test.com","contactPhone":"010203040506"},"type":"AUTHORIZATION_AND_CAPTURE"}}
response
{"code":"ERROR","error":"La orden con referencia [NEXWAY1428657558] no pudo ser procesada, la firma no es valida.","transactionResponse":null}