Online payment method and PayPal is the most secure payment gateway. If you have a very basic knowledge of PHP, you can easily implement the simple PayPal gateway in your site.
There are 3 main parts to the PayPal IPN system.
A webpage that initiates a request to PayPal to make a payment.
A PHP page on your webserver that PayPal calls to notify you that payment has been made.
A webpage that confirms the above payment and continues on to the next phase of your web application, such as a ‘Thank You’ page.
Parts 1 and 3 are accessible by customers on your website. Part 2 is only visible to PayPal. The diagram below illustrates the interaction between your customer, PayPal and your website.
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