[cherie]

Here's what we just implemented. This is with 4.0.14. Our conditions are payment method "Checks/Money Orders" and non-Wholesale customers.

1. Pass the paymentid by changing cart.php around line 587 from:

#
# Calculate all prices
#       
    $cart = func_array_merge ($cart, func_calculate($cart, $products, $login, $current_area));

to:

#
# Calculate all prices
#       
    $cart = func_array_merge ($cart, func_calculate($cart, $products, $login, $current_area, $paymentid));

2. Accept the paymentid by changing include/func.php around line 1007 from:

function func_calculate($cart, $products, $login, $login_type) {

to:

function func_calculate($cart, $products, $login, $login_type, $paymentid="") {

3. In the same file and function, pass the paymentid again by changing the following around line 1019:

$result = func_calculate_single ($cart, $products, $login, $login_type);

to:

$result = func_calculate_single ($cart, $products, $login, $login_type, "", $paymentid);

and around line 1034 from:

$result = func_calculate_single ($cart, $_products, $login, $login_type, $provider_for);

to:

$result = func_calculate_single ($cart, $_products, $login, $login_type, $provider_for, $paymentid);

and around line 1074 from:

$result = func_calculate_single ($cart, $_products, $login, $login_type);

to:

$result = func_calculate_single ($cart, $_products, $login, $login_type, "", $paymentid);

These last two changes may not be necessary.

4. In the same file, adjust function func_calculate_single to accept the paymentid by changing:

function func_calculate_single($cart, $products, $login, $login_type, $provider_for="") {

to:

function func_calculate_single($cart, $products, $login, $login_type, $provider_for="", $paymentid) {

5. In the same file and function, add the following towards the end of the function:

if ( ($customer_info[membership] != "Wholesale") && ($paymentid == 5) ) {
    $discounted_subtotal -= ($subtotal * .05);
    $display_discounted_subtotal = $discounted_subtotal;
}

just above:

#
# Calculate Gift Certificates cost (purchased giftcerts)
#

Your paymentid may be different as well as the exact membership name.

6. Adjust skin1/customer/main/cart_totals.tpl by adding the following after the if block for "if $cart.discount gt 0":

{if ( ($userinfo.membership ne "Wholesale") and ($smarty.get.paymentid eq 5) )}
{math equation="x*.05" assign="payment_discount" x=$cart.subtotal}
<tr>
    <td nowrap><font class="FormButton">Payment Discount:</font></td>
    <td>[img]{$ImagesDir}/null.gif[/img]</td>
    <td nowrap align="right"><font class="ProductPriceSmall">{include file="currency.tpl" value=$payment_discount}</font></td>
    <td nowrap align="right">{include file="customer/main/alter_currency_value.tpl" alter_currency_value=$payment_discount}</td>
</tr>
{/if}

To also display this information in the order history and invoice:

7. Add the following to function func_order_data in include/func.php towards the bottom just above the return:

if ( ($order[membership] != "Wholesale") && ($order[payment_method] == "Checks/Money Orders") ) {
    $order[discounted_subtotal] -= ($order[subtotal] * .05);
    $order[display_discounted_subtotal] = $order[discounted_subtotal];
}

8. Add the following to skin1/mail/html/order_data.tpl after the if block for "if $order.discount gt 0":

{if ( ($order.membership ne "Wholesale") and ($order.payment_method eq "Checks/Money Orders") )}
{math equation="x*.05" assign="payment_discount" x=$order.subtotal}
<tr>
    <td align="right" height="20">Payment Discount:</TD>
    <td align="right">{include file="currency.tpl" value=$payment_discount}</td>
</tr>
{/if}

Your exact payment method name may be different.

If anyone has any improvements to this, please post.