Question for anyone in the Coupon Niche

If you're in the coupon niche, do you know if there is a manufacturer database that you can search for coupons? If you have a coupon site, how you are able to feed all the current manufacturers coupons into your site? Don't worry, I'm not trying to compete in this niche. I just want to know if there is a database that manufacturers use to host their coupons. Thanks in advance.