# Party C VAT ID country

Source: https://developer.avalara.com/avatax-for-vat/zak6030562514557/

# Party C VAT ID country

Details about the Party C VAT ID country parameter used in triangulation transactions.

**Example**

**Element type:** Suggested for Triangulation

**Endpoints/models used:** [TransactionParameterModel](https://developer.avalara.com/api-reference/avatax/rest/v2/models/TransactionParameterModel/), [TransactionLineParameterModel](https://developer.avalara.com/api-reference/avatax/rest/v2/models/TransactionLineParameterModel/)

The `PartyCVATIDCountry` parameter is used in triangulation transactions to verify that Party C has provided a VAT ID for the country where the goods are shipping to. Users must specify this field for "Sale Party B to Party A" use cases when `IsTriangulation` isn't passed. When configuring the `PartyCVATIDCountry`, specify the country's 2-digit country ISO code.

If you don't include this field in your integration, then users can specify `"IsTriangulation": true`, and AvaTax will recognize that this is a triangulation transaction.

**Example**

```
...
  "parameters": [
    {
      "name": "MiddlemanVatId",
      "value": "RO123456"
    },
    {
      "name": "PartyCVATIDCountry",
      "value": "IE"
    },
    {
      "name": "Transport",
      "value": "Seller"
    }
...
```