Massive longshot but does anyone use Nomisma for payroll? We primarily use Xero but offer Nomisma to contractors and smaller clients with minimal bookkeeping transactions. In the past, we only used Nomisma Payroll to enter the journal but submitted the RTI through another software provider. We now want to use Nomisma for the whole process but I can't get a successful RTI submission due to "user credentials failing validation" (as far as I'm aware, everything is correct). If anyone has been able to submit an RTI via Nomisma, could I have a few minutes of your time to go through what I might be doing wrong?