TOTP OATH Authentication Form

We just got several TOTP (OATH standard) tokens and we are looking to implement two way authentication for our backoffice. The TOTP token manufacturer already provided with the seeds and token ids. We already have a form for standard login: username and password, now we are looking to ask for the OTP as another security measure to prevent unauthorized accesses. ONLY SERIOUS PROGRAMMERS (we have a PHP sample sent by the manufacturer but it is just for Joomla).