# ETK Rejection via SMS

The VIA SMS RET mechanism allows service providers with a ViA package to collect `ETK` rejection notifications from recipients via SMS. These messages are sent to the short code **3338** (`source: IYS_KISAMESAJ`).

* Rejection notifications can be processed using **brand IYS numbers** or **brand short names**.
* A **maximum of three brand short names** can be assigned per brand.
* Short names can be managed via the [**İYS Web**](https://hs.iys.org.tr/) portal under **Brand Short Name Management.**

### **Request Format (For IYS Test Environment)**

Recipients must send an SMS in the following format:

```plaintext
RET <BRAND_SHORT_NAME> SDXIYS → 3338
```

#### **Example Request:**

```plaintext
RET SDXNETMERA SDXIYS → 3338
```

### **Processing & Data Synchronization with Netmera**

When a recipient unsubscribes via SMS, their rejection is **recorded in the IYS system**.

**Netmera Sync:**

Netmera syncs data **nightly** to track and update permission changes. If a recipient’s permission status changes, it is **updated in Netmera's system automatically**.