# CustomerAlias

<mark style="color:blue;">`string`</mark>  <mark style="color:red;">`Zorunlu`</mark>

> If the recipient is an e-invoice taxpayer, this field specifies which label the invoice will be sent on.

{% hint style="info" %}
The recipient's label information is entered. If the recipient has more than one label, the corresponding label information must be entered.
{% endhint %}

{% hint style="warning" %}
This field should not be filled in on IHRACAT invoices.
{% endhint %}

```csharp
{
    EInvoice: {},
    CustomerAlias: "urn:mail:defaultpk@deneme.com" //Örnek olarak verilmiştir.
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://developer.nilvera.com/en/nilvera-model/einvoice/customeralias.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.