Integrating Payment systems into webstores can be highly complex and can be very costly.
Having worked with several payment gateway systems, for small scale operations I have found it to be prohibative.
There are easier Free systems that work just as well and information can be added to any form to let the customer know how to pay
Whether you wish to use Cash, Cheque, Paym, Paypal, PaybyLink or bank transfter, all personal payment information can be added and is safe behind a passworded gateway.
Integration through Payment partners like Worldpay, Square, Stripe, PayU, Bluesnap and many others is possible. Please get in touch to discuss your requirements.