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Paypal Integration


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I am using paypal to integrate a shopping cart into my site. I would like to know if anyone knows how paypal sends POST variables when there are multiple items. So my customer orders 2 items, I know how to get one item, but how does paypal send both? do they use an array? an item_name_1/2? how do they post back? does anyone here know?if you can help me, that would be awesome.

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I thought about a for loop, but the issue here being that how do I know what number to end on....there could be 1 item, there could be 100 items ordered. I plan to insert into a database each item that is sold individually for tracking purposes. So I guess I am asking, does paypal send a variable of how many items were purchased? I have been looking and can't seem to find one.

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