HTML:
> <form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top">
<input type="hidden" name="cmd" value="_s-xclick" />
<input type="hidden" name="hosted_button_id" value="GJUWN7CGNX9XQ" />
<input type="image" src="https://www.paypalobjects.com/it_IT/IT/i/btn/btn_donate_LG.gif" border="0" name="submit" title="PayPal - The safer, easier way to pay online!" alt="Fai una donazione con il pulsante PayPal" />
<img alt="" border="0" src="https://www.paypal.com/it_IT/i/scr/pixel.gif" width="1" height="1" />
</form>

URL condivisione:
> https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=GJUWN7CGNX9XQ&source=url