I have a situation with a shop-site where I communicate some shopping
details to an external website. The shopper pays it's dues over there,
and then get's redirected to the shop site. The requirements are that
the shopper actually has to go to the external site in the same
browser window: popup's etc are not allowed. In the meantime the
products are set aside, to make sure nobody else gets them while the
shopper pays.
Now the a shopper back from somewhere, with two variables: some
transaction ID that the external party creates and an entrance code,
that I can create myself.
I have thought of several approaches:
First I thought to use a direct-action to get the information. Then,
pickup the session where it's left off with all the shopping details,
check if the payment went all right, and get on to the next step. If
the user does not return, the session times out and the reservation on
products are returned to the database.
This approach will only work with one instance of an application on
one server. Say there are more instances, than the instance that
receives the directaction call might not be the one that is still
holding on to the session.
Second approach would be to store all the session information (the
products, user info etc) in a database table, and, once the user gets
back from the payment, pickup from there, and restore it's previous
information. But that might mean that the reservation on products that
have taken place (and are deducted from the available products) will
wait forever because the user is not returning.
So a thread would have to run all the time and remove all the
reservations that have not paid in let's say ten minutes.
I have a feeling that there might be another approach that is better
suited. I had a look at the WOPaypal framework, but I did not
completely understand what was going on there.
Perhaps somebody can explain to me how this works, or is there an
other approach that people use to solve this problem?
Regards,
Johan Henselmans
http://www.netsense.nl
Tel: +31-20-6267538
Fax: +31-20-6279159
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