Passing $myvariable through paypal button to return to example.com/$myvariable

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I have added my button script from Paypal to my php file and it outputs the buttons nicely.

I need $myvariable to be at the end of the return url where paypal sends someone back to my site upon successful payment.

This return url will be a constant but the $myvariable will be different with every customer.

ex: https://example.com/index3.php?processid=$myvariable $myvariable will be a 7 digit unique reference number.

I believe I must use Paypals "rm parameter" and have "return url" turned on at paypal developer.

The following was recommended in a 2011 post. But I don't know where to put it. <INPUT TYPE="hidden" NAME="return" value="<?php echo 'example.com/complete.php?option='.$theoption ?>">

Please, what code do I add to the following Paypal button code to get a return as described.

HERE IS MY BUTTON CODE FROM PAYPAL ("example.com" in script is paypal)

<div id="smart-button-container">
      <div style="text-align: center;">
        <div id="paypal-button-container"></div>
      </div>
    </div>
  <script src="https://www.example.com/sdk/js?client-id=sb&enable-funding=venmo&currency=USD" data-sdk-integration-source="button-factory"></script>
  <script>
    function initPayPalButton() {
      paypal.Buttons({
        style: {
          shape: 'rect',
          color: 'gold',
          layout: 'vertical',
          label: 'paypal',
          
        },

        createOrder: function(data, actions) {
          return actions.order.create({
            purchase_units: [{"description":"1 \".csv\" file download","amount":{"currency_code":"USD","value":19.95}}]
          });
        },

        onApprove: function(data, actions) {
          return actions.order.capture().then(function(orderData) {
            
            // Full available details
            console.log('Capture result', orderData, JSON.stringify(orderData, null, 2));

            // Show a success message within this page, e.g.
            const element = document.getElementById('paypal-button-container');
            element.innerHTML = '';
            element.innerHTML = '<h3>Thank you for your payment!</h3>';

            // Or go to another URL:  actions.redirect('thank_you.html');
            
          });
        },

        onError: function(err) {
          console.log(err);
        }
      }).render('#paypal-button-container');
    }
    initPayPalButton();
  </script>
phpvariablesbuttonpaypal