
Originally Posted by
DrByte
Simple: You don't.
When you enable PayPal in your Zen Cart admin->Modules->Payment screen, Zen Cart will automatically handle preparing and sending your customers' purchase requests through to Paypal.
Why exactly do you think you need to put PayPal buttons on your product pages? That's a concept that's only relevant to old-style shopping sites that have static HTML pages and no built-in ecommerce capability and the buy-now buttons are the only means of creating ecommerce/payment/checkout features for them.
Zen Cart is way more advanced than that, and does all that work for you. That's why Zen Cart puts an Add-To-Cart button on the page for you, and allows the customer to do checkout via the shopping cart.
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