Wepay checkout iframe plugin.
Quick usage guide: Add this simple shortcode into your post or page like this: [wepay amount="5" title="buy now" redirect="mylink.com" ]
Wepay checkout options plugin can be used easily to add a Checkout button to you product order link and your customers can make payment for those products. It supports iframe so customers don't have to leave your site for the payment. They can be redirected to a after checkout page that you can define in the options settings page. First of all signup for an app on wepay.com and use those credentials like API key, Secret, Account Id on the settings page to get started.