repopulate signup values on error

Are there any working code examples of a Paypal Pro sign up page that repopulates the form values on error(missing field or something).

I have been trying to use:

$firstname = $_POST[‘s2member-pro-paypal-checkout-first-name’];

and then:

<input type="text" aria-required="true" maxlength="100" autocomplete="off" name="s2member_pro_paypal_checkout[first_name]" id="s2member-pro-paypal-checkout-first-name" class="s2member-pro-paypal-first-name s2member-pro-paypal-checkout-first-name" value=" <?print $firstname ?>” tabindex=”10″ />

…welp

Should the values repopulate by default?

Thanks for your inquiry. ~ We appreciate your patience :-)

If a Pro Form is submitted, but there is an error, the fields that have already been filled in will be repopulated automatically. So no need to hack this in. It’s already built into the Pro Form integration.

If you were doing something like this, you would need to reference the array key.

$firstname = $_POST['s2member_pro_paypal_checkout']['first_name'];