Credit Card Processing & Merchant Account Services Paynet Systems provides credit card processing services to retail, wholesale, mail/phone order, commercial and eCommerce businesses. Because our systems and infrastructure are flexible we can offer custom-made programs for any business category. Doing business with you can be more convenient for your customers when you have Paynet Systems supporting your credit card processing needs for Visa®, MasterCard®, American Express®, Discover®, Diners Club,