PayPal IPN & LC
wow at together.net
Tue May 1 12:47:41 EDT 2012
Great! That seems to work.
On 5/1/2012 12:04 PM, J. Landman Gay wrote:
> On 5/1/12 9:36 AM, Richard Miller wrote:
>> Totally stuck on using PayPal's IPN process with LC. It doesn't appear
>> that there is any way to have PayPal send the IPN data to a LC cgi
>> script. Doesn't look like IPN supports cgi.
> It does, I've got the data coming in. The only issue I have is that
> PayPal hangs waiting for a response, and so it continues to resend
> transactions up to 15 times, until it finally assigns the transaction
> a "Failure" status and quits.
> Here's an outline of my working script, the one in the text file:
> on startup
> if $REQUEST_METHOD = "POST" then -- this is the only kind PayPal sends
> start using stack "liburl"
> read from stdin until empty
> put it into tOrderData
> if tOrderData is in url ("file:paypalLog.txt" ) then exit startup
> -- duplicate notification
> put "cmd=_notify-validate&" before tOrderData -- required response
> put "https://www.sandbox.paypal.com/cgi-bin/webscr" into tPPAddr
> post tOrderData to tPPAddr
> put it into tResponse -- "VERIFIED" or "INVALID"
> processData tOrderData -- do whatever with the data here
> end if
> end startup
> The real script has "LOG" commands all through it, and shows that data
> is coming in correctly, the posted reply is being sent, and "VERIFIED"
> is returned from PayPal.
> PayPal does not get a status code back from my cgi, which is the only
> issue I can't resolve. Because it doesn't think it's reached me, it
> continues to resend the transaction repeatedly. That's why the fourth
> line of the script checks to see if the data is already in the log; if
> so, it just drops the request. Note that an exit command in a cgi
> script will throw an error 500. PayPal does receive this status code
> and reports it in its IPN history log. That doesn't stop it from
> repeated sends though.
> Other than the resends, it works. You need to create a libURL stack
> and put it into cgi folder with 755 permissions. LibURL handles the
> POST command. The MC IDE already has one you can clone, or ask if you
> need info on how to make your own.
> In PayPal you can use the sandbox simulator. Set it to send
> transactions to the URL of your cgi script. If you create a sandbox
> test button, set that up with the cgi URL too.
> Except for the duplicate resends, it works.
More information about the Use-livecode