how to integrate paypal payment gateway in php

At Paypal account first merchant have to create Paypal account. Send the data to Paypal: <form action=”” method=”post”> <input type=”hidden” name=”cmd” value=”_xclick”> <input type=”hidden” name=”business” value=”Your merchant account”> <input type=”hidden” name=”currency_code” value=”USD”> <input type=”hidden” name=”item_name” value=”Shopping Products”> <input type=”hidden” name=”quantity” value=”1″> <input type=”hidden” name=”amount” value=”20″> <input type=”hidden” name=”return” class=”inputurlbox” value=”success url”> <input type=”hidden” name=”cancel_return” class=”inputurlbox” … Read morehow to integrate paypal payment gateway in php