# The counterparty is registered through a fiscal representative

Source: https://developer.avalara.com/vat-erp/transactions/certification-requirements/counterparty-registered-through-rep/

**Element type:** Required

**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/)

Your integration should allow users to specify whether the counterparty in a sales transaction is registered through a fiscal representative in a given country calculating VAT. This is done using the `IsCustomerRegisteredThroughFiscalRep` parameter in the [TransactionParameterModel](https://developer.avalara.com/api-reference/avatax/rest/v2/models/TransactionParameterModel/) or [TransactionLineParameterModel](https://developer.avalara.com/api-reference/avatax/rest/v2/models/TransactionLineParameterModel/). You can also add this information to the supplier/customer table.

[![Closed](https://avalara-devdocs-prod.mcoutput.com/vat-erp/Skins/Default/Stylesheets/Images/transparent.gif)View example](javascript:void\(0\);)

```
 {  "parameters":[    {      "name": "Transport",      "value": "none"    },    {      "name": "IsCustomerRegisteredThroughFiscalRep",      "value": "false"    }  ],  ...} 
```