Hi Alicia, thanks for reaching out to us. We don't natively support Magento 1.9. However, with some tinkering, you should be able to use our HTTP connector or create a custom SDK connector to connect with Magento 1.9. For more details, check out the Magento 1.x REST API docs at http://devdocs.magento.com/guides/m1x/api/rest-api-index.html.
Send us a ticket, we will try our best to assist you with your problem
Alicia Power
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