If you are using Paypal IPN, you will need to do a bit of additional work to make SMS on Sale work. Edit the file ipn_main_handler.php at the top level of your store, find the line
Code:
$order->send_order_email($insert_id, 2);
it's line 219 in 1.3.7. Change this to:
Code:
$order->send_order_email($insert_id, 2);
require(DIR_WS_CLASSES . 'observers/class.msg_owner.php');
$mo = new msg_owner();
$mo->update($this, 'NOTIFY_CHECKOUT_PROCESS_AFTER_SEND_ORDER_EMAIL');
Thanks to s_mack for taking the time to describe this approach in another thread.
Scott
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