Payment process for SEO service

Hey everybody,
I want to make a little seo service site and I haven chosen paypal als my payment processor. After someone paid for my service via paypal he needs to be redirected to a page where he can enters his details such as "targeted urls and/or keywords".

How have you realized such an interface? It needs to be secure from people that haven't paid for my service and it should only be used once per payment. But what if my buyer wants to get back, because he has closed the redirected window by mistake?

Please any ideas how I can make a simple payment process where you can enter your site/keyword details and pay via paypal?

I know I could use magento but rly.. I just want to sell one product at first.

best wishes,
whery

Good way of marketing

I suggest you to use WHMCS , its far better

thx for the replies. But I've found a faster solution: http://wordpress.org/extend/plugins/wordpress-simple-paypal-shopping-cart/

I just change the download page to a formula and voila my own SEO Service page.

whery said:

thx for the replies. But I've found a faster solution: http://wordpress.org/extend/plugins/wordpress-simple-paypal-shopping-cart/

I just change the download page to a formula and voila my own SEO Service page.

Click to expand...

I'm looking to do the same thing as you with another service, not SEO. Can you please explain the formula page of your response.