Q:

Amazon MWS - Max Order Quantity

How can i Get and Set the "Max Order Quantity" on a product listing?
In some categories this is under the Offer tab inside Seller central.
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A:

You should use Amazon Feed API. Documentation you can find here: https://images-na.ssl-images-amazon.com/images/G/01/rainier/help/XML_Documentation_Intl.pdf 
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Title - REQUIRED
SKU - REQUIRED
StandardProductID - NOT REQUIRED BUT RECOMMENDED
This XML construction use like SubmitFeed(XML) and it will change your MaxOrderQuantity value
For testing it you can use amazon scratchpad site.
For set or updating "Max Order Quantity" use FeedType - "_POST_PRODUCT_DATA_"

