Cannot redirect to paynow on chect out


Hie, we have a problem integrating our website with paynow, got the API and key but when its time for checkout its not redirecting to paynow. We logged off from website, opened paynow merchant and left it open and then when back to website to perform a transaction to allow for fake payment of test payment, but it gives a message that test payment can only be performed by a customer from the same company. The question is which other company, does it mean it can be done by paynow on our behalf or what. Its been two weeks and a half without any break througj.