curl --request GET \
  --url https://api.qovery.com/application/{applicationId}/environmentVariable \
  --header 'Authorization: Bearer <token>'

{
  "results": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "created_at": "2023-11-07T05:31:56Z",
      "key": "<string>",
      "scope": "APPLICATION",
      "variable_type": "VALUE",
      "updated_at": "2023-11-07T05:31:56Z",
      "value": "<string>",
      "mount_path": null,
      "description": "<string>",
      "enable_interpolation_in_file": true,
      "overridden_variable": {
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "key": "<string>",
        "value": "<string>",
        "mount_path": "<string>",
        "scope": "APPLICATION",
        "variable_type": "VALUE"
      },
      "aliased_variable": {
        "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
        "key": "QOVERY_DATABASE_PSQL_NAME",
        "value": "<string>",
        "mount_path": "<string>",
        "scope": "APPLICATION",
        "variable_type": "VALUE"
      },
      "service_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "service_name": "<string>",
      "service_type": "APPLICATION",
      "owned_by": "<string>"
    }
  ]
}