PayPal Website Payments Standard API -

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I have the answer that it is somewhere in PayPal documentation, but I am reading it for two days and for my eyes < / P>

For website payment standard, I create a page on my site (let's call it Page A ), which has a dynamically-formized form in which a hidden bunch The details of carriage material, price of each item, etc. are included. It also has a token to identify the seller vendor and a visual form element: the submitted image.

Customer clicks the image, which submits the form to PayPal. PayPal does talk to us (in which we are posting some data on a URL that we define (we call it Page B )), and then returns the customer back to us (again From a URL we define, let's call this Page C ).

Whatever I see is some kind of transaction ID, we can see the page A and C and B A hit from PayPal has been hit by the user. How do we know that these three hits apply to the same transaction? (The hit on the page can not be definitely C .)

In a different question, do I think only one that the PayPal document is misleading? ?

A little more reading suggests possible answers.

We already use A and C as the same user and using the session ID, A We can set a form field named Custom that contains any of our information, it will be posted back to PayPal on the B page, unchanged used to identify the user. I can play with it and can see that I can work it.


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