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Can you please tell us more about this, is there an error you see or something else?
Also pleasee try to follow this steps to generate your API key and if you can integrate again: http://ug.infusionsoft.com/article/AA-00442/0/How-do-I-enable-the-Infusionsoft-API-and-generate-an-API-Key.html
Please let me know if it worked for you.