I'd say it would depend on the product being sold. Most could probably get away with just a paypal button.
i have a product set up, a landing page coded and written out.
How do i go about they payment? could anyone give me advice on how what to use and how to do it?
I would also consider 2CO or Plimus, depending upon what it is your web site is selling.
Once you select a payment processor, then we can talk about implementation steps.
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