With this Plugin you'll find within System -> Configuration -> Checkout and Customers -> Customer Groups and within each price-section of a product a new section where you can filter for different payment methods.

After Installation you have to setup your customer groups to ENABLE for each payment method.

On the other hand products have the ability to DISABLE single payment methods.

Please remove old version of "cGroupPayments" and execute the following SQLstatement inside you database:
ALTER TABLE `customer_group` DROP `allowed_payment_methods`; to remove old table columns.

Thanks to Netzarbeiter Vinai Kopp and Medienagenten for Sponsorship of the preliminary module!