You can integrate paypal with GAE using thrid part cart feature. I have used
it

On Tue, May 4, 2010 at 11:33 AM, Vaclav Bartacek <
[email protected]> wrote:

> The only way I found and successfully use is the PayPal Button (saved
> on the server + 'custom' attribute) + IPN mechanism (over SSL) to
> receive transaction statuses. Other ways could not be probably
> implemented now due to the current GAE restrictions - mainly: you
> cannot add a new JCE provider now.
>
> Vaclav
>
>
> On May 3, 7:47 am, shamel <[email protected]> wrote:
> > How  to integrate paypal with app engine??
> >    i have got many errors when integrating this. main exceptions are
> > org.xml.sax.SAXNotSupportedException:
> http://xml.org/sax/features/external-general-entities
> >         at
> >
> org.apache.xerces.framework.XMLParser.setExternalGeneralEntities(XMLParser.java:
> > 486)
> >         at
> org.apache.xerces.framework.XMLParser.setFeature(XMLParser.java:
> > 1298)
> >         at
> org.apache.xerces.parsers.SAXParser.setFeature(SAXParser.java:578)
> >         at
> > org.apache.xerces.jaxp.SAXParserImpl.setFeatures(SAXParserImpl.java:
> > 150)
> > ...................
> >
> > please help me as fast as possible???
> >
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