> For the complete documentation index, see [llms.txt](https://docs.hackle.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hackle.io/en/development-guide/flutter/user-identifier/flutter-user-info-crm.md).

# CRM Properties

CRM Properties are stored securely only on the Hackle server and cannot be directly queried through the SDK.

{% hint style="danger" %}
CRM Properties are managed separately and are not deleted or reset even if you call `resetUser()` or `clearAll` in `updateUserProperties`.

If a user withdraws their account, you must call the separately provided function to delete the information.
{% endhint %}

## Phone Number Collection

{% hint style="info" %}
This feature is supported in Flutter SDK 2.16.0 and above.
{% endhint %}

{% hint style="success" %}
Kakao / Text Message Recommendation

By using this feature to map the User Identifier to a phone number, you can more seamlessly use Kakao messages and Text Messages through Hackle.
{% endhint %}

#### setPhoneNumber

Registers the user's phone number.

The phone number is stored only if it is in valid E.164 format. If no country code is specified, South Korea (+82) is used as the default.

If the user already has a stored phone number, calling this function replaces the existing phone number with the new value.

```dart
String myPhoneNumber = '+821012341234';
HackleApp.setPhoneNumber(myPhoneNumber);
```

#### unsetPhoneNumber

Deletes the phone number registered for the user.

```dart
HackleApp.unsetPhoneNumber();
```

## CRM Marketing Subscription Consent

{% hint style="info" %}
This feature is supported in Flutter SDK 2.20.0 and above.

For more details about subscription consent states, refer to the [CRM Message Subscription Consent Management documentation](/en/development-guide/sdk/user-identifier/crm-subscription.md).
{% endhint %}

### Subscription Consent Properties

You can subscribe or unsubscribe by message purpose.

Use `HackleSubscriptionOperationsBuilder` to configure the consent state for the desired properties, then finalize the update using methods like `updatePushSubscriptions()`.

You can update the consent state per message channel.

```dart
import "package:hackle/hackle.dart";

var operations = HackleSubscriptionOperationsBuilder()
    .marketing(HackleSubscriptionStatus.SUBSCRIBED)
    .information(HackleSubscriptionStatus.SUBSCRIBED)
    .build();

HackleApp.updatePushSubscriptions(operations);
```

#### Promotional Messages

Sets the subscription consent property for promotional messages.

```dart
import "package:hackle/hackle.dart";

var operations = HackleSubscriptionOperationsBuilder()
    .marketing(HackleSubscriptionStatus.SUBSCRIBED)
    .build();

HackleApp.updatePushSubscriptions(operations);
```

#### Informational Messages

Sets the subscription consent property for informational messages.

```dart
import "package:hackle/hackle.dart";

var operations = HackleSubscriptionOperationsBuilder()
    .information(HackleSubscriptionStatus.SUBSCRIBED)
    .build();

HackleApp.updatePushSubscriptions(operations);
```

<table><thead><tr><th width="224.09765625">HackleSubscriptionStatus</th><th>Description</th></tr></thead><tbody><tr><td><code>UNKNOWN</code></td><td>Subscription Consent has not been given or denied (<code>default</code>)</td></tr><tr><td><code>SUBSCRIPTION</code></td><td>Explicitly opted in to receive messages</td></tr><tr><td><code>UNSUBSCRIPTION</code></td><td>Explicitly opted out of receiving messages</td></tr></tbody></table>

### Update Push Subscription Consent Status

Updates the user's push message subscription consent status.

```dart
import "package:hackle/hackle.dart";

var operations = HackleSubscriptionOperationsBuilder()
    .marketing(HackleSubscriptionStatus.SUBSCRIBED)
    .information(HackleSubscriptionStatus.SUBSCRIBED)
    .build();

HackleApp.updatePushSubscriptions(operations);
```

### Update Kakao Message Subscription Consent Status

Updates the user's Kakao message subscription consent status.

```dart
import "package:hackle/hackle.dart";

var operations = HackleSubscriptionOperationsBuilder()
    .marketing(HackleSubscriptionStatus.SUBSCRIBED)
    .information(HackleSubscriptionStatus.SUBSCRIBED)
    .build();

HackleApp.updateKakaoSubscriptions(operations);
```

### Update Text Message Subscription Consent Status

Updates the user's Text Message subscription consent status.

```dart
import "package:hackle/hackle.dart";

var operations = HackleSubscriptionOperationsBuilder()
    .marketing(HackleSubscriptionStatus.SUBSCRIBED)
    .information(HackleSubscriptionStatus.SUBSCRIBED)
    .build();

HackleApp.updateSmsSubscriptions(operations);
```


---

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