> For the complete documentation index, see [llms.txt](https://user.netmera.com/netmera-user-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://user.netmera.com/netmera-user-guide/customer-data/iys-permissions/iys-sync-mode.md).

# İYS sync mode

**İYS sync mode** allows businesses to use **İleti Yönetim Sistemi (İYS)** as the authoritative source for user communication consents.

Use this mode when consent records are already managed in İYS and Netmera needs to retrieve and use those records.

With İYS sync mode:

* Netmera can **read** consent records from İYS.
* Netmera can **update** consent records for users who already exist in İYS.
* Netmera **cannot create** new consent records in İYS.
* Netmera regularly synchronizes consent information from İYS.

### İYS integration modes

| Mode                    | Source of truth | Create new records in İYS | Update existing records |
| ----------------------- | --------------- | ------------------------- | ----------------------- |
| **İYS sync mode**       | İYS             | No                        | Yes                     |
| **İYS integrator mode** | Netmera         | Yes                       | Yes                     |

### Step 1: Authorize Netmera in the İYS Panel

To enable full functionality, you must authorize Netmera within the İYS platform:

1. Log in to your İYS panel.
2. Go to the **İş Ortaklığı (Partnerships)** section.
3. Search for and select **Netmera** as your solution partner.
4. Make sure the following permissions are enabled:
   * Message Permissions
   * Call Permissions
   * Email Permissions

This step allows Netmera to receive and manage user permission data on your behalf, ensuring that all communication is aligned with İYS regulations.

<figure><img src="https://1642824329-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FX6uilbEAw42gqsudlclY%2Fuploads%2FgX1O6bHdNu2nd9JRl1GC%2Fimage.png?alt=media&amp;token=5200c392-3936-4dc6-80f1-7bf32dad766f" alt="" width="326"><figcaption></figcaption></figure>

### Step 2: Enable the İYS integrator mode

After granting the required permissions in the İYS portal, configure the integration in Netmera.

In the Netmera Panel:

1. Go to **Settings > Integration > İYS**.
2. Enable **İYS**.
3. Enter your İYS credentials:
   * **Brand Code:** Enter the Brand Code provided by İYS.
   * **İYS Code:** Enter the İYS Code provided by İYS.

#### Optional settings

* **Via Integration:** Select this checkbox when you use Via. See the [Via integration guide](https://user.netmera.com/netmera-developer-guide/integrated-modules/via-integration).
* **İYS Integrator:** Select this checkbox when Netmera updates İYS records. See [İYS integrator mode](/netmera-user-guide/customer-data/iys-permissions/iys-integrator-mode.md).

<figure><img src="https://1642824329-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FX6uilbEAw42gqsudlclY%2Fuploads%2Fey5C2PuGyFVYB9t1ul9p%2FScreenshot%202026-02-11%20at%2015.36.33.png?alt=media&amp;token=12ada203-6490-4239-86b0-4aa46d33e5ff" alt="İYS integration settings" width="375"><figcaption><p>Configure the İYS integration settings.</p></figcaption></figure>

#### Synchronization schedule

Netmera begins synchronizing user permissions after you install the integration.

* **Initial synchronization:** Starts overnight and runs in batches until Netmera processes existing user records.
* **Ongoing synchronization:** Updates user permissions from your latest İYS data after the initial synchronization finishes.


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