// PUT /admin/tiers/{id}/
{
    "tiers": [
        {
            "name": "Silver",
            "description": "silver"
        }
    ]
}

PUT /admin/tiers/{id}/
Required fields: name Update all writable fields of a tier by using the edit endpoint. For example, rename a tier or set it as archived with this endpoint. 
// PUT /admin/tiers/{id}/
{
    "tiers": [
        {
            "name": "Silver",
            "description": "silver"
        }
    ]
}