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Tags should be treated as case-insensitive
Tags should be treated as case insensitive, however, avoid using case as the only differentiator between tags. For example, My Tag and my tag can cause problems.
Commas are prohibited in tag creation.

{
	"tag":{
		"tag": "My Tag",
		"tagType": "contact",
		"description": "Description"
	}
}

{
    "tag": {
        "tag": "My Tag",
        "description": "Description",
        "tagType": "contact",
        "cdate": "2018-09-29T19:21:25-05:00",
        "links": {
            "contactGoalTags": "https://:account.api-us1.com/api/:version/tags/16/contactGoalTags"
        },
        "id": "16"
    }
}