Online payment service PayPal, a subsidiary of eBay, rolled out on Friday a second factor for authenticating users online — a key fob that generates a pseudo random security code every 30 seconds.

Following a beta program launched at the RSA Security conference in February, the service is now available for both eBay and PayPal customers, the companies said in a statement. The security token, produced by security-services firm VeriSign, generates a pseudo-random six-digit number every 30 seconds that can be authenticated through VeriSign’s Identity Protection service.