I have a js script which prints a value to innerText of a span. I am trying to take this value and pass it onto paypal as an amount.

The process goes:

form.php --> process.php --> PayPal

Because i am using a script i found online i cannot go directly to PayPal as the form action is already set to the send.php. Therefore i need to pull the value from span in form.php, into process.php and then into PayPal. I have tried using $_SESSION variables but it didn't work and when i var_dumped the session it showed an array when i was expecting a simple integer.

Im not quite sure which code is useful/relevant

Code:
<div class='pcontainer'>
    <label for='words' >Words:</label><br/>
    <span id="words"> </span><br/>
    <span id='contactus_email_errorloc' class='error'></span>
</div>
<div class='pcontainer'>
    <label for='tprice' >Price:</label><br/>
    <span id="tprice"> </span><br/>
    <span id='contactus_email_errorloc' class='error'></span>
</div>
Because the transition from form.php to proces.php is a re-direct and not a form action, could i still use POST/GET?

Code:
<?PHP
session_start();

$_SESSION["price"] = $_GET["tprice"];
Any help would be greatly appreciated,

Thanks!