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Postback from third party and updated client browser

I am trying to wrap my head around a secure process for handling payments with CyberSource (a payment processor).

The setup has been approved by our company security group to work as follows:
1.) client requests a page with a CC form
2.) client fills out and submits the CC form via AJAX call and directly POSTs to CyberSource
3.) CyberSource does it's thing and returns a code and description from the result to the server
4.) The server must identify that the postback from CyberSource relates to a particular client and then update that client's browser with the appropriate message (success, error, etc..)

I'm having a hard time figuring out how I can proactively send a message to an existing browser session without a request originating from that client's browser. Does anyone have some light they can shed on this?

I figure an alternative could be a client-side timer that pings the server and checks the database to see if a postback has been received, but that seems inefficient and would add a lot of server load.
any ideas? is there a particular term or protocol that I should be looking up that describes my desired setup?
Thanks!
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dale_abrams
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dale_abrams
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GaryCommented:
Number 2 would be very unusual - that would mean exposing your security details.

Normal scenario, if you don't want to post the form, is to send the ajax request to your server, have your php script make the call to the api, wait for the response from CyberSource and then send a response back to the browser.
Ajax has a callback method that will wait for the response so there is nothing you need to do but let the code wait for a response and in your js have a routine to handle the callback when it arrives.
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dale_abramsAuthor Commented:
Hi Gary,
I work for a large company with a security group that has a lot of oversight on the way that applications are set up. They have specified that they do not want the payment info to touch our servers, so the setup where the client posts to our server and then we forward to CyberSource is not an option. Do you have any ideas regarding how i can push an update to a client browser after my server receives the post back from CS?
Thanks,
Dale
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GaryCommented:
The comment above still applies, just changing the post to their server.
The ajax will wait for the callback response and in the callback you do whatever with the response.
Are you using jQuery or plain javascript?
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dale_abramsAuthor Commented:
Unfortunately, your suggestion isn't an 'approved' method because the client could potentially manipulate the decision data before it gets back to our servers. I have actually proposed both of your suggestions and they have been shot down. The only approved method I can work with is to have CS post back to our server and then I push an update to the client browser, or, as I mentioned above, to set up a timer that pings the server from the client to see if the post back has been received.

I am using jQuery and AJAX calls.
Thanks,
Dale
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GaryCommented:
So you want to send the result to CyberSource's server but receive the response back to your own server?
How does CyberSource send the response? Is it a postback to a page on your server with no response sent back to the ajax call.
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dale_abramsAuthor Commented:
That is correct. I provide CS with our server page to receive the response and then have to find a way to push this out to the client. So far, the method where I continually ping is the only way I can come up with.
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GaryCommented:
The only other way, which is kinda similar, is long polling.  Create a connection and keep it open til it receives a response from your server.
http://techoctave.com/c7/posts/60-simple-long-polling-example-with-javascript-and-jquery

I cannot think of any other way of doing it.
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dale_abramsAuthor Commented:
Your link was helpful with the different types of polling. I think I'm going to have to resign to polling being that I've never heard of a true push mechanism. Thanks for your help Gary!
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GaryCommented:
There is HTML5 sockets, but that is reliant on an HTML5 browser and quite a bit more work setting it up.  It's not something I would bother with for the likes of this.
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dale_abramsAuthor Commented:
Yeah, I saw that. I need to have it working on all browsers. Taking payments is too imperative to only work on some of them. Thanks!
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