---
title: "Advanced Routing Example"
description: "Advanced Euclid rule tree examples for /routing/create, including AND, OR, nested rules, and value variants."
---

# Advanced Routing Example

Use `algorithm.type = advanced` when a merchant needs conditional rule-based routing instead of a fixed connector order. Advanced rules evaluate payment attributes, choose the first matching rule output, and fall back to `default_selection` when no rule matches.

## Advanced Program Shape

```json
{
  "globals": {},
  "default_selection": {
    "priority": [
      { "gateway_name": "stripe", "gateway_id": "mca_stripe" }
    ]
  },
  "rules": [],
  "metadata": {}
}
```

| Field | Meaning |
| --- | --- |
| `globals` | Optional reusable value sets referenced by `global_ref`. |
| `default_selection` | Fallback `single`, `priority`, `volume_split`, or `volume_split_priority` output. |
| `rules[].routing_type` | Rule output behavior: `priority`, `volume_split`, or `volume_split_priority`. |
| `rules[].output` | Connector output returned when the rule matches. |
| `rules[].statements[].condition` | Conditions inside one statement. All conditions in the same array must match. |
| `rules[].statements[].nested` | Optional nested statements. Parent condition must match and then nested statements are evaluated. |

## Full Create Request

```bash
curl --location "$BASE_URL/routing/create" \
  --header "$AUTH_HEADER" \
  --header "Content-Type: application/json" \
  --data '{
    "name": "advanced card routing",
    "created_by": "merchant_demo",
    "description": "Route Visa card traffic by priority, otherwise fallback to stripe",
    "algorithm_for": "payment",
    "algorithm": {
      "type": "advanced",
      "data": {
        "globals": {},
        "default_selection": {
          "priority": [
            { "gateway_name": "stripe", "gateway_id": "mca_stripe" }
          ]
        },
        "rules": [
          {
            "name": "visa_card_rule",
            "routing_type": "priority",
            "output": {
              "priority": [
                { "gateway_name": "adyen", "gateway_id": "mca_adyen" },
                { "gateway_name": "stripe", "gateway_id": "mca_stripe" }
              ]
            },
            "statements": [
              {
                "condition": [
                  {
                    "lhs": "payment_method_type",
                    "comparison": "equal",
                    "value": { "type": "enum_variant", "value": "CARD" },
                    "metadata": {}
                  },
                  {
                    "lhs": "card_network",
                    "comparison": "equal",
                    "value": { "type": "enum_variant", "value": "Visa" },
                    "metadata": {}
                  }
                ],
                "nested": null
              }
            ]
          }
        ],
        "metadata": {}
      }
    }
  }'
```

## Logic Variants

### AND Rule

Use one `condition` array when all conditions must match.

```json
{
  "name": "high_value_netherlands_rule",
  "routing_type": "volume_split",
  "output": {
    "volume_split": [
      {
        "split": 60,
        "output": { "gateway_name": "hdfc", "gateway_id": "mca_hdfc" }
      },
      {
        "split": 40,
        "output": { "gateway_name": "instamojo", "gateway_id": "mca_instamojo" }
      }
    ]
  },
  "statements": [
    {
      "condition": [
        {
          "lhs": "amount",
          "comparison": "greater_than",
          "value": { "type": "number", "value": 100 },
          "metadata": {}
        },
        {
          "lhs": "billing_country",
          "comparison": "equal",
          "value": { "type": "enum_variant", "value": "Netherlands" },
          "metadata": {}
        }
      ],
      "nested": null
    }
  ]
}
```

### OR Rule

Use multiple statements when any statement can trigger the rule.

```json
{
  "name": "card_or_high_value_rule",
  "routing_type": "priority",
  "output": {
    "priority": [
      { "gateway_name": "paytm", "gateway_id": "mca_paytm" },
      { "gateway_name": "adyen", "gateway_id": "mca_adyen" }
    ]
  },
  "statements": [
    {
      "condition": [
        {
          "lhs": "payment_method_type",
          "comparison": "equal",
          "value": { "type": "enum_variant", "value": "CARD" },
          "metadata": {}
        }
      ],
      "nested": null
    },
    {
      "condition": [
        {
          "lhs": "amount",
          "comparison": "greater_than",
          "value": { "type": "number", "value": 100 },
          "metadata": {}
        }
      ],
      "nested": null
    }
  ]
}
```

### Nested AND + OR Rule

Use `nested` when a parent condition must match and then one nested branch can match.

```json
{
  "name": "amount_and_card_network_or_country_rule",
  "routing_type": "priority",
  "output": {
    "priority": [
      { "gateway_name": "rbl", "gateway_id": "mca_rbl" },
      { "gateway_name": "instamojo", "gateway_id": "mca_instamojo" }
    ]
  },
  "statements": [
    {
      "condition": [
        {
          "lhs": "amount",
          "comparison": "greater_than",
          "value": { "type": "number", "value": 10 },
          "metadata": {}
        }
      ],
      "nested": [
        {
          "condition": [
            {
              "lhs": "card_network",
              "comparison": "equal",
              "value": { "type": "enum_variant", "value": "Visa" },
              "metadata": {}
            }
          ],
          "nested": null
        },
        {
          "condition": [
            {
              "lhs": "billing_country",
              "comparison": "equal",
              "value": { "type": "enum_variant", "value": "India" },
              "metadata": {}
            }
          ],
          "nested": null
        }
      ]
    }
  ]
}
```

## Output Variants

### Priority Output

```json
{
  "routing_type": "priority",
  "output": {
    "priority": [
      { "gateway_name": "adyen", "gateway_id": "mca_adyen" },
      { "gateway_name": "stripe", "gateway_id": "mca_stripe" }
    ]
  }
}
```

### Volume Split Output

```json
{
  "routing_type": "volume_split",
  "output": {
    "volume_split": [
      {
        "split": 70,
        "output": { "gateway_name": "stripe", "gateway_id": "mca_stripe" }
      },
      {
        "split": 30,
        "output": { "gateway_name": "adyen", "gateway_id": "mca_adyen" }
      }
    ]
  }
}
```

### Volume Split Priority Output

Use `volume_split_priority` when each split should return a priority list rather than a single connector.

```json
{
  "routing_type": "volume_split_priority",
  "output": {
    "volume_split_priority": [
      {
        "split": 60,
        "output": [
          { "gateway_name": "stripe", "gateway_id": "mca_stripe" },
          { "gateway_name": "adyen", "gateway_id": "mca_adyen" }
        ]
      },
      {
        "split": 40,
        "output": [
          { "gateway_name": "checkout", "gateway_id": "mca_checkout" },
          { "gateway_name": "stripe", "gateway_id": "mca_stripe" }
        ]
      }
    ]
  }
}
```

## Value Variants

### Enum Variant Array

```json
{
  "lhs": "card_network",
  "comparison": "equal",
  "value": {
    "type": "enum_variant_array",
    "value": ["Visa", "Mastercard"]
  },
  "metadata": {}
}
```

### Number Array

```json
{
  "lhs": "amount",
  "comparison": "equal",
  "value": {
    "type": "number_array",
    "value": [1000, 2000, 5000]
  },
  "metadata": {}
}
```

### Number Comparison Array

```json
{
  "lhs": "amount",
  "comparison": "equal",
  "value": {
    "type": "number_comparison_array",
    "value": [
      { "comparison_type": "greater_than", "number": 1000 },
      { "comparison_type": "less_than_equal", "number": 5000 }
    ]
  },
  "metadata": {}
}
```

## Notes

- Advanced algorithms require `statements`; top-level `single`, `priority`, and `volume_split` algorithms do not.
- Conditions in the same `condition` array behave like AND.
- Multiple statements behave like OR.
- `nested` allows a parent condition plus nested branch matching.
- `volume_split` percentages should add up to 100.

## Related

- [Create Routing Algorithm](/decision-engine-api-reference/api-reference/guides/configure-routing/routing-algorithm-create)
- [Evaluate Routing Algorithm](/decision-engine-api-reference/api-reference/guides/configure-routing/routing-algorithm-evaluate)
- [Priority Routing](/decision-engine-api-reference/api-reference/guides/configure-routing/routing-priority-example)
- [Volume Split Routing](/decision-engine-api-reference/api-reference/guides/configure-routing/routing-volume-split-example)
