Plimus is a 3rd party payment processor which collect payments on behalf of the software publisher and does electronic and/or CD Delivery of the software to the customers when the payment has been accepted. Plimus accepts all major credit cards, paypal, bank transfers, checks and Purchase Order sales amongsts others. Once all the money are collected and consolidated, Plimus will send you the money minus fees to either your paypal account, as a check, wire transfer, ACH transfer or to the Payoneer card. In Plimus since you are selling products, you would need to set up Products and then within each product, set up Contracts which would contain the product information, prices and all that. Paste that link to your website or give it to your customer so they can complete the payment process.