Ok, you need some script that will receive the data from clicbank, and store it in your database. The same script can verify the payment and allow or disallow the download.
However, this is by far a complicated script, it has taken me almost 20 days to set up my own Instant Download Cart, and i consider myself experienced with php.
In other words, whilst the core for the database storing part is as i have posted above, this exceeds what can be done simply giving you instructions. Here is how IDC works (only with PayPal at the moment):
The user orders (one or more items).
The order details are stored in the database, and then the customer is taken to an "Order preview" page. He is then automatically taken to PayPal, where he payes and he is taken back to your site.
the script here performs a number of tasks:
receives the data from PayPal, opens a connection slot with them, and retreives al possible details from them (email, name, transaction ID, country of residence etc) . It checks if the payment is complete or not (as in the case of e checks). If the payment is completed, it redirects to a download page, where all the product links are displayed. It also sends a email to the customer, with his order details and a re-download link for future use, and stores the data in the Orders Database (in your case it could also update the Autoresponder database). If it finds that the payment is incomplete, displayes a page where it informs the customer that his order will be manually processed upon payment confirmation. If it finds that there is no correspondance between PayPal details and order details, it recognizes the visit as an illegitimate attempt to download the products. It will however, in this case, prompt the customer to contact the site administrator, through an automated contact form.
All these features, have to be built with lits of security checks, to avoid problems.
It is not something you can do so easily, it requires lots of time and experience.
A simpler solution, only to update the Autoresponder database, requires a simple script to be added after the point you have (as you said) already extracted the info from the Clickbank post and you simply need to store the email, name etc in the autoresponder database.
I can do this for you, if you want
contact me.