curl --request GET \
  --url https://matcher.sandbox.lerian.net/v1/discovery/connections/{connectionId}/schema \
  --header 'Authorization: Bearer <token>'

{
  "connectionId": "<string>",
  "tables": [
    {
      "tableName": "<string>",
      "columns": [
        {
          "name": "<string>",
          "type": "<string>",
          "nullable": true
        }
      ]
    }
  ]
}