curl --location "$BASE_URL/routing/create" \
  --header "$AUTH_HEADER" \
  --header "Content-Type: application/json" \
  --data '{
    "name": "volume split rule",
    "created_by": "merchant_demo",
    "algorithm_for": "payment",
    "algorithm": {
      "type": "volume_split",
      "data": [
        {
          "split": 70,
          "output": { "gateway_name": "stripe", "gateway_id": "mca_111" }
        },
        {
          "split": 30,
          "output": { "gateway_name": "adyen", "gateway_id": "mca_112" }
        }
      ]
    }
  }'