Why is the invoice page different for another user? - drupal

Question

When I go to admin/store/orders/50457/invoice as the administrator, I see the following:
Notice how it has a payment method of "Free order" and the total at the bottom is $0.00.
When I go to the same page as a non-administrator, I see the following:
Notice how Payment Method is empty and the total for the order is $8.21.
The correct one is what the administrator sees, so what is going on that makes the two behave differently?
EDIT: It turns out in a module I created (a long time ago) called tf_store_credit.module, I have the following:
function tf_store_credit_line_item(){
global $user;
$total_credit= uc_store_credit_f_get_user_credit($user->uid);
if ($total_credit>0){
$items[] = array
(
'id' => 'store-credit', // You will use this ID in the javascript
'title' => t('Store Credit'), // This is the text that will be displayed on the line item in the subtotal
'callback' => 'tf_store_credit_line_item_callback', // This is the callback function
'stored' => TRUE,
'default' => FALSE,
'calculated' => TRUE,
'display_only' => FALSE,
'weight' => 15,
);
}
return $items;
}
The problem is that it is getting the currently logged in user's store credit instead of the user who placed the order. So how would I go about getting the correct user?

Answer 1

In tf_store_credit.module, I modified it like this:
function tf_store_credit_line_item(){
global $user;
$total_credit= uc_store_credit_f_get_user_credit($user->uid);
if ($total_credit>0 || in_array("view_orders", $user->roles)){
$items[] = array
(
'id' => 'store-credit', // You will use this ID in the javascript
'title' => t('Store Credit'), // This is the text that will be displayed on the line item in the subtotal
'callback' => 'tf_store_credit_line_item_callback', // This is the callback function
'stored' => TRUE,
'default' => FALSE,
'calculated' => TRUE,
'display_only' => FALSE,
'weight' => 15,
);
}
return $items;
}
In uc_free_order.module, I did a similar thing so that "Payment method" showed up:
function uc_free_order_payment_method() {
global $user;
if ($user->name=='blah' || $user->name=='blah2' || in_array("view_orders", $user->roles)){
$methods[] = array(
'id' => 'free_order',
'name' => t('Free order'),
'title' => t('Free order - payment not necessary.'),
'desc' => t('Allow customers with $0 order totals to checkout without paying.'),
'callback' => 'uc_payment_method_free_order',
'checkout' => TRUE,
'no_gateway' => TRUE,
'weight' => 10,
);
return $methods;
}
}