curl --request GET \
  --url https://api-partner.houdiniswap.com/v2/exchanges/multi/{multiId}/tx \
  --header 'Authorization: <api-key>'

{
  "multiId": "<string>",
  "chain": "<string>",
  "transactions": [
    {
      "houdiniIds": [
        "<string>"
      ],
      "txData": {
        "data": "<string>"
      }
    }
  ]
}