Paypal recurring payment code is as below:
<form name=”_xclick” action=”https://www.paypal.com/cgi-bin/webscr” method=”post”>
<input type=”hidden” name=”cmd” value=”_xclick-subscriptions”>
<input type=”hidden” name=”business” value=”youremail@domain.com”>
<input type=”hidden” name=”currency_code” value=”USD”>
<input type=”hidden” name=”no_shipping” value=”1″>
<input type=”image” src=”http://www.paypal.com/en_US/i/btn/btn_subscribe_LG.gif” border=”0″ name=”submit” alt=”Make payments with PayPal – it’s fast, free and secure!”>
<input type=”hidden” name=”a3″ value=”5.00″>
<input type=”hidden” name=”p3″ value=”1″>
<input type=”hidden” name=”t3″ value=”M”>
<input type=”hidden” name=”src” value=”1″>
<input type=”hidden” name=”sra” value=”1″>
</form>
If you want to use the subscription for fixed period(installment) then use <input type=”hidden” name=”srt” value=’6″> .