?>
<form action="https://www.paypal.com/cgi-bin/webscr" method="post" id="formulario">
<input type="hidden" name="cmd" value="_cart">
<input type="hidden" name="upload" value="1">
<input type="hidden" name="business" value="tu_correo_paypal@gmail.com">
<input type="hidden" name="currency_code" value="MXN">
<?php
for($i=0;$i<count($datos);$i++){
?>
<input type="hidden" name="item_name_<?php echo $i+1;?>" value="<?php echo $datos[$i]['Nombre'];?>">
<input type="hidden" name="amount_<?php echo $i+1;?>" value="<?php echo $datos[$i]['Precio'];?>">
<input type="hidden" name="quantity_<?php echo $i+1;?>" value="<?php echo $datos[$i]['Cantidad'];?>">
<?php
}
?>
<center><input type="submit" value="comprar" class="aceptar" style="width:200px"></center>
</form>