by borojimmy » Fri Sep 11, 2009 3:16 pm
This really does depend, really, the only information that should be shared between the two web sites is this:
The merchant ID
The cost of the product
The name of the product
A description of the product
and how many you are buying.
The name of the person buying the item,
and possibly the IP address,
if the details of the credit card (number, name of card holder CVV2 number etc.) are taken from Amazon then these details are also passed along
if, like ebay you are sent to PayPal where paypal then taker the card details, only the product details and merchant ID are sent.
What happens then is this, these details are then processed by Paypal or other payment gateway, no confidential details are sent back to the original site only a 'Yes', 'No' and 'Reason they were declined'
The original site then takes this message and tells the user if it has been successful or not.
if the transaction is successful then the merchant ID is credited with the cost of the product.
this has been simplified somewhat but this is in essence how it works.
Hope this helps,
Jimmy