retaining form values in checkout

I was wondering if there was a way to retain form field values when a user goes back to edit information before making an order. My purchase looks like this:

1. checkout form (credit card info, bill address, etc)
2. review information
3. Submit order

If the user finds something they need to change in step 2 I'd like to be able to go back to step 1 but with the form already filled in with the previous information. I tried adding something like this to the value field: <?php echo $_SESSION['eCartCheckoutForm_cc_number']; ?> but it's showing up blank with an empty value when I view source.

Actually, on the same topic I think, is it possible to have the purchase information show up in the success page so they can print their order info for their records? I can't seem to find any session info in my success page.

The values should be stored as session variables, I think if you set the field value to the session it should work. If you refresh the page does it then fill in?

It might be because it uses a history.back() to navigate back?

Didn't work, I've tried adding values from both the "session" bindings list and the "ecart_checkout_form" bindings but both are giving me blank forms, even on refresh.

Test case for session:
<input type="text" name="cc_number" id="cc_number" value="<?php echo $_SESSION['eCartCheckoutForm_cc_number']; ?>" />

Test case for checkout form:
<input type="text" name="firstname" id="firstname" value="<?php echo((isset($_POST["firstname"]))?$_POST["firstname"]:"") ?>" />

If I were using the checkout wizard would these values stick they I'm trying to get them to work?

Do you have:
<?php session_start(); ?>

on top of the page?

I added it but that didn't seem to do the trick. Here's all the PHP I have at the top right now:

<?php session_start(); ?>

<?php
//WA eCart Include
require_once("../WA_eCart/bellaCart_PHP.php");
?>
<?php
$bellaCart->GetContent();
?>
<?php
require_once("../WA_eCart/PP_ECO_Scripts/PP_ECO_PHP.php");
?>
<?php
require_once("../WA_eCart/Adv_CO_Scripts/PP_DirectPayment_PHP.php");
?>

Should I make sure that session command is in all the checkout pages?

actually if you have a session based cart on the page it already has the session started. I just can't figure out why it wouldn't be populating the fields from the session. Are you sure you are using the correct session variable names?

Pretty sure I'm grabbing the right variables, I'm just dragging them from the session bindings menu into the code (see attached for a partial list of the elements I'm using)

For the review page I'm actually populating the review text with the ecart_checkout_form variables, when I try to use the session variables there nothing shows up either. It would seem that the session is there in the binding but it's not populating at any point. I also checked my other eCart enabled pages and they all feature the same session bindings indicated in the attached image file. Maybe there's some sort of disconnect between the bindings and my code because I haven't been using the wizard?

Yes, if you run the wizard once on your site, it always thinks the session variables are set even if you deleted those pages and start over. I would say you probably have to set the session variables on the confirm page so that you can use them to populate the checkout page when they go back.

That makes sense, here comes the dumb question: how would I set those session variables? And would those vars be available to me after I've completed the transaction with my payment gateway so I can present the user with a proper receipt? (I assume yes on the 2nd point but figured I'd ask anyway)

I also know I've said this before but I really appreciate the help, you're saving me hours on a project I underbid on in the first place. New lesson learned, don't give friends a professional discount ;-)

On your confirm page, go to bindings and add the Form from the checkout page.

Then use the server behavior in the Ecart General Category to save the session variables. You will have to apply it once for each field you want stored. Just use the current session variable names since they aren't being used.