I have a subscription website which charges people $49 per month for the subscription. As a part of the marketing I want to offer 1 month free. If anyone knows any payment gateways, please let me know what I can use. I have just been researching clickbank and they have a 56 day money back guarantee, which causes a problem with affiliate payments that I have to make.
I cannot offer a specific solution but you might want to look at this review of 6 payment gateways, I'm sure one of the bigger ones like Authorize.net or Verisign would have the option you need.
Why not use PayPal? They offer some solid plans that allow recurring payments to be set up with ease.