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I had received a comment on my previous post Payment system with Paypal about injecting wrong product price values via third party site using FORM, this is a valid point. So that I had updated my previous post code “success.php” re-confirming the product price details before payment success message and added new field class ‘currecy type’ on “products” table.

I received a tutorial requests from my reader that asked to me how to implement payment gateway system with Paypal API. In this post I want to explain how to work with Paypal Sandbox test accounts for payment system development and sending arguments while click buy now button. It’s simple and very easy to integrate in your web projects.