curl https://api.thanxsandbox.com/purchases/wourhfiwer/tags \
  -X PUT \
  -H "Content-Type: application/json"  \
  -H "Accept-Version: v4.0" \
  -H "Accept: application/json" \
  -H "X-ClientId: ${client_id}"
  -d '{
    "tag": {
      "key": "server_satisfaction",
      "values": [
        "10"
      ]
    }
  }'

{
  "tag": {
    "id": "werwerr",
    "purchase_id": "wourhfiwer",
    "key": "server_satisfaction",
    "values": [
      "10"
    ]
  }
}