limit products to said payment gatways

i have been looking into bitcoins and one site that amember supports via the plugin drop down.

little hard to work out the guide, as not how it is on the website, but the thing i want to ask is that bitpay says it does`nt work with recurring payments, ie monthly memberships.

so how do i limit only this payment to year subs and not monthly and leave the option say for stripe on all.

thanks