There's 4 payment options:
1. Netbilling - Billed as MFCBill.com*Tokens
2. CCBill - Billed as CCBill.com*Activesoft
3. RocketGate - Billed as MFCGate.com*Tokens
4. Paypal via Segpay - Segpay.com
If you want one that isn't as noticable, would be CCBill or Segpay.