Incoming order notification is empty

[NaviteLogger]

I didn't know where to look for help, so I decided to post the issue here: The incoming notification POST-ed by PayU to my nofityUrl is empty ( which results in the failure in signature check ):

Signature comparison: 
{incoming 15 0 incomingHash<nil>}
{expected 15 0 expectedHash <nil>}
{concatenated 15 0 {"order":"orderId":"","extOrderId":"00000000-0000-0000-0000-000000000000","orderCreateDate":"0001-01-01T00:00:00Z","notifyUrl":"","customerIp":"","merchantPosId":"","description":"","currencyCode":"","totalAmount":"","status":""}} incomingHash<nil>}

Could anyone tell me what I might be doing wrong?

[regdos]

You can log a raw request from PayU, because it is impossible to have this data missing?

[NaviteLogger]

I guess the API just had a bad day ;) The following day API responded with correct data