OsCommerce payment module 2checkout – order not showing in OSC. - Urgent

OsCommerce payment module 2checkout – order not showing in OSC. - Urgent 1. After trying to resolve this issue with another freelancer, it still does not work properly. We did achieve it to work one time, but after trying several times after, it did not work anymore 2. We are able to purchase an item using 2checkout, 3. Client is notified by 2co that purchase was done, but client does not receive the purchase order via email nor does the purchase order show in the admin. So we are not sure what the customer has purchased. 4. Last contribution which was installed by freelancer is this one: [login to view URL],3540/category,1/search,2checkout