[ic] Interactive Payment Gateway

[interchange-users@icdevgroup.org (Jeff Fearn)]

Hi, I am trying to setup an external payment gateway. The difference with 
this gateway is that the credit card details are entered on the external 
site. This means that I must pause payment processing while the customer 
interacts with the external site. The external site will fully process the 
credit card transaction, so once it is complete the order will be paid for.

The problem I am having is syncronising the display/pause behaviour. I have 
added a new payment module, similar to the other modules - authorize.net 
etc, and I can pause within this module. I also have the pages necessary to 
display the external sites pages. However any page display will not occur 
until after the payment module has finished.

Logic flow is:
    click process button
    goto payment module
    display external site
    handle response
    return to checkout/receipt as appropriate

However what I am getting is:
    click process button
    goto payment module
    queue external site display
    return to checkout as processing failed
    display external site

grrrrr

What I need is either a way to display the page without finishing the 
process module, or to be able to validate the order without completing it, 
hand off to the payment site, then return and complete the order/display the 
receipt etc.

Any help is very welcome :)

I suppose I should tell you the gateways process, just in case I am _way_ of 
the mark :}

  1: Call their site, include your ID, a unique reference, and the amount
  2: Customer enters CC details and clicks OK
  3: Gateway calls a script on your server to verify ref/amount
  4: Gateway process transaction
  5: Gateway calls another script on your server informing result of 
transaction
  6: Gateway displays page telling customer of transaction results

I have the scripts syncronised with semaphores and a 3 minute timeout, I'd 
enlarge that in production environment.

Jeff.



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