For PayPal integration on App Engine, you need to ensure that you split your PreAuth/Capture phases (i.e., never do a straight up Purchase), and you have to implement their IPN mechanism to know the true state of things. A PreAuth takes longer than a Capture, but if a PreAuth times out, the consequences are less: on your IPN, if you get a PreAuth transaction that you don't know about (i.e., because it timed out), simply Void it. If your PreAuth succeeds, you can issue a Capture which is typically quite quick.
It's a pain given the short(ish) url fetch timeout (or, if you look at it another way, the long time PayPal takes to process cards sometimes), but it can be done. j On Sep 30, 8:51 am, stevep <prosse...@gmail.com> wrote: > If you are referring to Paypal url calls made under their test > environment -- these ran much more slowly (variably) for me vs. > production. Overall, GAE is difficult to ensure PP completion. I'd > made several comments a long time ago (b/4 pull queues & instances) > for a single, high-performance TQ to address key weaknesses. Note: My > only frame of reference is PP's digital goods purchase process. > > HTH, > stevep > > On Sep 29, 1:40 am, PK <p...@gae123.com> wrote: > > > > > > > > > I have integrated my site with a cool online payments service. They provide > > an API for online payments that I access from the server side using the > > urlfetch() API. Unfortunately, once in a while their service takes a little > > bit more than 10 seconds to respond on the pay API, so the payment goes > > through but my code gets a timeout and reports an error to the user which is > > very frustrating. > > > I am trying to get the online payments vendor to improve their response > > times but I was wondering why did you pick 10 instead of 20 seconds for the > > urlfetch maximum timeout. In 30 seconds there is enough time to get in, do a > > 20 second urlfetch and return in worst case. > > > Thanks, > > PK > > > PS Yes I have thought of doing the urlfetch from a task but the code gets > > pretty complicated pretty fast. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
