The AXN Attribute Dictionary includes details on each of the standard attributes available in the AXN. Each of the attributes includes a description, as well as the JSON required.

The JSON of each attribute should be included in the User Attributes array when interacting with the /verify or /slverify resources.

{
   "asi": "", #Flow parameter
   "credential": "", #Flow parameter
   "appID": "", #Flow parameter
   "apikey": "", #Flow parameter
   "userAttributes": [ 
        {
            "attributeType": "FullName", #Attribute
            "values": {
                "fname": "m",
                "lname": "d",
                "mname": "c"
            }
        },
        {
            "attributeType": "InternationalAddress", #Attribute
            "values": {
                "country": "US",
                "locality": "richmond"
            }
        }
	]
}

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Note
Each API key will require different attributes as inputs, depending on how it was configured. Make sure that the service you are trying to invoke is configured to handle the attributes you are sending it. Otherwise, you will get failures.