# 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.
}
```