How to set the IPN

Login to your Clickbank account now and click on "Account Settings" --> "My Site". See the screenshot below:

Then, scroll to the bottom of the page, under the "Advance Tools" section.

Click on the EDIT link on the right.

Enter a secret key. Choose any arbitary string all UPPERCASE (maximum 16 characters - only alpha numeric characters).For example "DKFSFYBGVX"

NOTE: If this is your first time requesting IPN access, then click on the "request access" link and answer a series of questions (choose "YES" to all them and check the box). See the screenshot below:

Then, you'll be able to enter the IPN URL, see the following screen shot:

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For the Instant Notification URL enter
http://easycbbonus.com/ecb/ecb_cbipn.php

Your final screen should look something like the screenshot below. Note that the secret key shown here is merely an example.