Optimizepress uses standard PayPal button code for accepting payment. So you can use our standard PayPal button integration method to integrate Optimizepress with the affiliate plugin.
Alternatively, you can use our eStore plugin with Optimizepress to sell your products/items from the landing page. You use Optimizepress to create the landing page and eStore to create the “buy button” to sell the product. The eStore plugin has built in integration with the affiliate plugin.