Click the thunderbolt () icon next to the package you wish to use for instructions.
In Paypal Payflow Manager (https://manager.paypal.com under SERVICE SETTINGS - PAYFLOW LINK - CONFIGURATION), set the Return URL Method to POST and set the Return URL and Failed Silent Post Return URL fields to the following, (using the full URL to this link):
Use either HTTP or HTTPS, depending on what your store is using. For example:
Set the "Silent Post URL" field to (using the full URL to this link):
Clear the "Force Silent Post Confirmation" check box(unchecked), and save the configuration of Payflow Link.
On the Cubecart store admin page, go to Manage Plugins and edit the properties of the Payflow plugin to include your merchant details. These are the same as you use to log in to the Payflow Manager website. The Payflow URL should be set to https://payflowlink.paypal.com (correct as at the time of this posting but check the Payflow user guide if in doubt).