curl --request GET \
  --url https://api.deepl.com/v3/glossaries \
  --header 'Authorization: <api-key>'

{
  "glossaries": [
    {
      "glossary_id": "def3a26b-3e84-45b3-84ae-0c0aaf3525f7",
      "name": "My Glossary",
      "dictionaries": [
        {
          "source_lang": "EN",
          "target_lang": "DE",
          "entry_count": 1
        },
        {
          "source_lang": "DE",
          "target_lang": "EN",
          "entry_count": 2
        }
      ],
      "creation_time": "2021-08-03T14:16:18.329Z"
    }
  ]
}