I posted a small update to the AX2012 R3 cXML protocol handler for punchOuts. This update you can find up on codeplex here http://AX2012R3cxml.codeplex.com
This updates includes some extra error handling for the punchOut setup request response from suppliers. Please refer to my original post with setup details on how to use the cXML protocol handler sample code.
While working with customers implementing cXML based punchOuts with AX2012 the following suppliers were used in the US. If you are working with these suppliers and have a B2B account with them to use their punchOut sites then you should be able to use the cXML protocol handler.
Previously Software Spectrum
MSC Industrial Direct
If you are working with other suppliers I’d be interested in hearing from you.