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Comment PayPal 'Instant Payment Notification' in PHP (Score 1) 438

I use PayPal's 'Instant Payment Notification' (IPN) feature for my software download site at www.Centiare.com. Once the user's cc info is verified on PP's end, PP and I exchange a series of transmittals before the user is allowed access to my secure download center. It takes around a microsecond and is all done in PHP and https - it works really well.

If you want to see it in action, go to Centiare. If you have any tech questions, send me a private reply at karln@centiare.com. Oh, before I forget:

So, my wife wants to know why I think advertising on the Internet would be a good idea. But first, I should probably explain the family dynamic: she's an Ivy League grad and attorney while I have a UC degree and CPA certificate. Usually, she's the one who is right, so I figure I should probably listen (as if I have a choice).

I figure it makes pretty good economic sense, since many different sites with low CPM rates still get over a million page views per day. Problem is, she replies, there's probably only around 150-200k unique visitors at any of these respective locations, each of whom is triggering around 5-7 page views per person per day.

And besides, she continued, using the Jungean Archetype model to illustrate her point, the target audience is devoted to reason, not emotion. This, I concede, defeats one of my central tenets: applying a test to determine whether a person is Apollonian or Dionysian, left-brain or right-brain, etc. in order to assess the likelihood of downloading Centiare, my cool little cash management/forecasting program for individuals and small businesses.

Centiare quickly and automatically calendarizes projected deposits, payments and running cash balances over any time period selected - the output looks like a spreadsheet. But since transactions are stored in a database, the way it works is through a series of SQL pivot/transformation functions. The results are stored within multiple counter arrays to keep track of time periods, monthly totals, and grand totals. Once the recordset is complete, viola', the whole thing is formatted and printed - the flash report looks really good.

And besides, it's free to try, and only $20 to buy!

To be continued ...Centiare

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