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I wan to many requirements on integration between AX 2012 and Magneto:
1/ I want to transfer on-hand transaction from AX 2012 to Magneto (1000 items)
2/ I want to Magneto create sale order and synchronize it to AX 2012
3/ I want to Magneto create customer and synchronize it to AX 2012
1/ I will use technology (Ex: Web Service, JSON) solve it.
Yes, web services are a good approach to application integration.
JSON is just a format.