If you use dap generated button for paypal or the dap shopping cart, you can specify at button-level where you want the users redirected upon...
If you use a dap generated button, then read this on google analytics:
Use this control to limit the display of threads to those newer than the specified time frame.
Allows you to choose the data by which the thread list will be sorted.
Order threads in...
Note: when sorting by date, 'descending order' will show the newest results first.