2CheckOut "2CO" Parameter Set Help!

I’d like some expert to guide me how to make back or return URL script page with PHP where in case of a successful purchase, I’d already prepare a Return URL (One page contains all procedures needed) in which redirect user back to my site where customer would get the matching return info regarding product he/she ordered to as example:
1- Customer selects Remote Desktop Support and clicks the Buy from 2CO button.
2- Customer redirected to 2CO website and does the purchase.
3- When approved instantly (Credit Card Purchase), it redirects this customer back to the Return URL page procedure in which (if remote desktop support >> send administrator an e-mail and show customer a message that he will receive a PIN code shortly).
And this is if customer selects a small business website template:
2-Same step 2 above.
3- When approved instantly (Credit Card), it redirects this customer back to the Return URL page procedure in which (if small business website template >> send administrator a confirmation e-mail and allow customer either to download the template without making modifications (one time secure download) or allow customer to e-mail [email][email protected][/email] with site contents…etc and it will get processed shortly.

For parameters you might need, here is 2CheckOut parameters set manual where 2CheckOut is the merchant 3rd party I will put my return URL to:
for Approved URL page:
[url]https://www.2checkout.com/documentation/UsersGuide2/chapter1/custom-checkout-area.html#CONFIG_LOOK_FEEL[/url]
For full parameter set (I’d like also to know how to make pass back information page sent by e-mail and store in database using those: [url]https://www.2checkout.com/documentation/UsersGuide2/chapter6/setup-configurations.html#IID_5[/url])

I’ve spent months to setup this, in vain. I hope you help me as soon as possible.

Regards,
Ahmed Mahdy

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