# SDK Methods

## Manually Triggering the Opt-In Prompt

You may choose to disable automatic triggering of the opt-in prompt via the platform. In this scenario you would choose to trigger the prompt based on your own criteria (eg: after a visitor clicks a specific link, visits a specific page, etc).

Triggering the prompt is as easy as calling the `show_prompt` event when a visitor performs the desired action.

```javascript
pushly('show_prompt', { checkEligibility: true })
```

If you want the prompt to show regardless of current subscription status or frequency capping (i.e., manually displaying a bell or custom prompt) this can be simplified to the following code.

```javascript
pushly('show_prompt')
```

## Adding Attributes to a Subscriber's Profile

You can add attributes to a subscriber's profile and later perform segmentation based on those attributes. For example, you may want to tag visitors who are interested in a specific type of news (eg: politics, sports) so that you can target them with specific notifications.

```javascript
pushly('profile', {
  'is_paying_subscriber': true,
  'interests': ['poltics', 'news']
});
```

{% hint style="info" %}
Property values can be scalar or an array of scalar values.
{% endhint %}

If you're storing the value of a property as an array you can use the `profile_append` and `profile_remove` methods to add or remove values.

```javascript
// add 'sports' to the subscriber's interests
pushly('profile_append', {
  'interests': ['sports']
});

// remove 'fashion' and 'news' from the subscriber's interests
pushly('profile_remove', {
  'interests': ['fashion', 'news']
});
```

{% hint style="warning" %}
Properties using `profile_append` will only store the most recent 20 values provided.
{% endhint %}

## Adding Page Keywords / Tags to a Subscriber's Profile

You can add page keywords / tags to a subscribers profile for every page they visit. These tags can then be used in segmentation to create cohorts of subscribers that have visited tags based on number of times and recency. For example: "Subscribers who have visited a page tagged with "Astrology" at least 4 times in the last 30 days".

```javascript
pushly('page_tag_visit', ['Tag1', 'Tag2', 'Tag3']);
```

## Retrieving the Subscriber's User ID

{% hint style="warning" %}
This method is only available after the SDK is fully loaded. This SDK method should be wrapped inside of the `on_ready` [event](https://documentation.pushly.com/integration/web-push/sdk/events).
{% endhint %}

Run the following code to the get the user's Pushly ID. This is a transient ID that may change often so it should not be used for long-term visitor identification.

```javascript
pushly('on_ready', function() {
    PushlySDK.getUser().getId();
});
```

## Setting the Subscriber's External ID

Providing a unique User ID for your subscriber allows you to later interact with that subscriber via the API.

There are two ways to provide the external ID:

#### On SDK Init

Preferably you may provide the external ID when the SDK is initialized. This requires adding one additional line of code to the `load` function. Note the new `externalId` line in the below script:

```javascript
<script src="https://cdn.p-n.io/pushly-sdk.min.js?domain_key=DOMAIN_KEY" async></script>
<script>
  var PushlySDK = window.PushlySDK || [];
  function pushly() { PushlySDK.push(arguments) }
  pushly('load', {
    domainKey: 'DOMAIN_KEY',
    externalId: 'REPLACE_WITH_USER_ID'
  });
</script>
```

#### Via a separate method call

Alternatively you may provide the external ID any time after the SDK has loaded via the following code:

```javascript
pushly('external_id', 'h7bwKwuE3');
```

Once a subscriber's external ID has been set you may work with our team to set up bi-directional automated data syncs. The following use cases are common ways that publishers use the external ID via server-to-server requests:

* Sending notifications to individual subscribers programmatically
* Processing unsubscribe requests
* Adding and removing profile attributes and events to subscribers

## Removing a Subscriber's External ID

If you want to disassociate an External ID from a subscriber run the following javascript:

```javascript
pushly('deregister_external_id');
```

## Determining if a Visitor is Already Subscribed

{% hint style="warning" %}
This method is only available after the SDK is fully loaded. This SDK method should be wrapped inside of the `on_ready` [event](https://documentation.pushly.com/integration/web-push/sdk/events).
{% endhint %}

If you need to know if a visitor is already subscribed to push notifications the following javascript can be used:

```javascript
pushly('on_ready', function() {
    await PushlySDK.isUserSubscribed();
});
```

The result of this call will be a boolean `true` or `false` representing the subscription status of the visitor.

{% hint style="info" %}
Note the use of the [`on_ready`](https://documentation.pushly.com/integration/web-push/events#example-on_ready) event to ensure that the SDK is ready for interaction.
{% endhint %}

## Determining if a Visitor is Eligible to Prompt

{% hint style="warning" %}
This method is only available after the SDK is fully loaded. This SDK method should be wrapped inside of the `on_ready` [event](https://documentation.pushly.com/integration/web-push/sdk/events).
{% endhint %}

If you need to determine if the visitor meets all requirements to be prompted for push permission run the following JavaScript:

```javascript
pushly('on_ready', function() {
    await PushlySDK.isUserEligibleToPrompt();
});
```

The result of this call will be a boolean `true` or `false` representing if the visitor is eligible to be shown a permission dialog.

{% hint style="info" %}
Note the use of the [`on_ready`](https://documentation.pushly.com/integration/web-push/events#example-on_ready) event to ensure that the SDK is ready for interaction.
{% endhint %}

## Pausing / Resuming a User's Notifications (Soft Unsubscribe)

A user's notifications can be paused by calling the following method:

```javascript
pushly('pause_notifications')
```

If the user's notifications should be resumed call the following method:

```javascript
pushly('resume_notifications')
```

To check if the user's notifications are currently paused:

```javascript
pushly('get_notifications_paused_state', (isPaused) => { ... })
```

## Permanently Delete a User

If the user should be excluded from all notifications and tracking run the following method:

```javascript
pushly('request_user_deletion');
```

{% hint style="warning" %}
This method works only as a soft unsubscribe. If the subscriber clears their cookies they may get re-opted into notifications.
{% endhint %}