Right after the seller has created the code for a PayPal Buy Now button or a Shopping Cart is truly really vital to make sure he properly handles the digital items through Instant Payment Notification (IPN). The IPN component of the program can possibly send customizable emails to notify the seller and of course, the purchaser regarding the operation that occurred with digital items.

There is no need for a database since the events of the transactions are stored in a text document for further investigation.

And also if the seller already utilizes an IPN script, he can still use it. Each of the variables about purchase collected from PayPal will also be transferred for even more handling to the old script as a POST request.

Initially, the form fields have already been loaded with valid data regarding to a PayPal Buy Now button in Sandbox Test Environment. The seller just needs to change those fields which are specific about its digital goods. Next it is recommended yet not mandatory to save the PayPal Buy Now button in the current directory to load it later. PayPal Buy Now button can be tested by a simple click.

As a result of purchase, PayPal redirects the web browser to a custom thank-you page specified by the merchant. That contains a unique download hyperlink generated with Payment Data Transfer (PDT) module for these electronic items. Further, it is easy to customize the thank-you web page with specific variables of PayPal Button Generator together with the ones obtained via PayPal.

At last, it is definitely vitally worthwhile to secure the PayPal Buy Now button or Shopping Cart against fraud on digital goods of the seller.

About Simplex Solver

Simplex Solver develops portable applications that run directly from a browser. It is specialized in JavaScript and PHP user-friendly software interface that shows not only the result of solving mathematical problems but also how it was reached in a visual manner. For example, Simplex Solver 1.0 web application makes full use of the simplex method to optimize (maximizes or minimizes) a linear objective function Z subject to a number of linear restrictions (first degree equations and inequalities). After entering the input data the user can press Solve button and move the mouse over tables' cells. He will find a visual description of how the numerical values were obtained.

Contact Simplex Solver at teachmesoft@simplexsolver.com or call +40 721 513 607 to get more details.