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laravel-conversions-api

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A laravel wrapper package around the Facebook Conversions API

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# Interact with the Facebook Conversions API

[![Latest Version on Packagist](https://img.shields.io/packagist/v/esign/laravel-conversions-api.svg?style=flat-square)](https://packagist.org/packages/esign/laravel-conversions-api)
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This package allow you to easily interact with the [Facebook Conversions API](https://developers.facebook.com/docs/marketing-api/conversions-api/).

## Installation

You can install the package via composer:

```bash
composer require esign/laravel-conversions-api
```

Next up, you can publish the configuration file:
```bash
php artisan vendor:publish --provider="Esign\ConversionsApi\ConversionsApiServiceProvider" --tag="config"
```

The config file will be published as config/conversions-api.php with the following content:
```php
return [
    /**
     * The access token used by the Conversions API.
     */
    'access_token' => env('CONVERSIONS_API_ACCESS_TOKEN'),

/**
     * The pixel ID used by the Conversions API.
     */
    'pixel_id' => env('CONVERSIONS_API_PIXEL_ID'),

/**
     * The Google Tag Manager container ID used in case you're deduplicating
     * events through Google Tag Manager instead of Facebook Pixel directly.
     * Should look something like "GTM-XXXXXX".
     */
    'gtm_id' => env('GOOGLE_TAG_MANAGER_ID'),

/**
     * The Conversions API comes with a nice way to test your events.
     * You may use this config variable to set your test code.
     */
    'test_code' => env('CONVERSIONS_API_TEST_CODE'),
];
```

In case you want to customize the view components you may also publish the views:
```bash
php artisan vendor:publish --provider="Esign\ConversionsApi\ConversionsApiServiceProvider" --tag="views"
```

## Conversions API

### Events
To add events to the conversions API you may use the `addEvent`, `addEvents` or `setEvents` methods.
Retrieving or clearing events may be done using the `getEvents` and `clearEvents` methods:
```php
use Esign\ConversionsApi\Facades\ConversionsApi;
use FacebookAds\Object\ServerSide\UserData;
use FacebookAds\Object\ServerSide\Event;

ConversionsApi::addEvent(
    (new Event())->setEventName('PageView')->setEventId('abc')
);

ConversionsApi::setEvents([
    (new Event())->setEventName('PageView')->setEventId('abc'),
    (new Event())->setEventName('Purchase')->setEventId('xyz'),
]);

ConversionsApi::getEvents();
ConversionsApi::clearEvents();
```

Adding events won't cause them to be sent to the Conversions API.
To actually send the events you must call the `sendEvents` method:
```php
use Esign\ConversionsApi\Facades\ConversionsApi;

ConversionsApi::sendEvents();
```

#### Creating event classes
To make things a bit cleaner you may extend Facebook's default event class:

```php
use Esign\ConversionsApi\Facades\ConversionsApi;
use FacebookAds\Object\ServerSide\ActionSource;
use FacebookAds\Object\ServerSide\Event;

class PurchaseEvent extends Event
{
    public static function create(): static
    {
        return (new static())
            ->setActionSource(ActionSource::WEBSITE)
            ->setEventName('Purchase')
            ->setEventTime(time())
            ->setEventSourceUrl(request()->fullUrl())
            ->setEventId((string) Str::uuid())
            ->setUserData(ConversionsApi::getUserData());
    }
}
```
```php
ConversionsApi::addEvent(
    PurchaseEvent::create()
);
```

### User Data
This package also comes with a way to define default user data for the user of the current request.
You may do so by calling the `setUserData` method.
You can set the user data for every incoming request by creating a custom middleware like this one:

```php
namespace App\Http\Middleware;

use Esign\ConversionsApi\Facades\ConversionsApi;
use Esign\ConversionsApi\Objects\DefaultUserData;

class InitializeFacebookUserData
{
    public function handle(Request $request, Closure $next): Response
    {
        ConversionsApi::setUserData(
            DefaultUserData::create()
                ->setEmail($request->user()?->email)
        );

return $next($request);
    }
}

```

You can now use it in `App\Http\Kernel` as a global middleware or a route middleware.

You may now pass the user data along with your events:
```php
use Esign\ConversionsApi\Facades\ConversionsApi;
use FacebookAds\Object\ServerSide\Event;

ConversionsApi::addEvent(
    (new Event())->setUserData(ConversionsApi::getUserData())
);
```

## Event deduplication
This package comes with a few ways to assist you in [deduplicating browser and server events](https://developers.facebook.com/docs/marketing-api/conversions-api/deduplicate-pixel-and-server-events/). This can either be done using the Facebook Pixel directly or through Google Tag Manager's data layer.

### Facebook Pixel
Before attempting to send events through Facebook Pixel make sure to load the pixel script:
```blade
<x-conversions-api-facebook-pixel-script />
```

This will render the following html:
```html
<script>
    !function(f,b,e,v,n,t,s){if(f.fbq)return;n=f.fbq=function(){n.callMethod?
    n.callMethod.apply(n,arguments):n.queue.push(arguments)};if(!f._fbq)f._fbq=n;
    n.push=n;n.loaded=!0;n.version='2.0';n.queue=[];t=b.createElement(e);t.async=!0;
    t.src=v;s=b.getElementsByTagName(e)[0];s.parentNode.insertBefore(t,s)}(window,
    document,'script','https://connect.facebook.net/en_US/fbevents.js');

fbq('init', 'your-configured-pixel-id', {});
</script>
```

This package will attempt to provide as much advanced matching data as possible by using user data from the `ConversionsApi`.
For example when an email address is set, it will automatically be provided to the init method:
```php
ConversionsApi::setUserData(
    (new UserData())->setEmail('john@example.com')
);
```
```js
fbq('init', 'your-configured-pixel-id', {"em": "john@example.com"});
```

Now that your Pixel is correctly initialized, it's time to send some events.
Sadly the parameters between the Conversions API and Facebook Pixel are not identical, so they must be mapped to the [correct format](https://developers.facebook.com/docs/meta-pixel/reference).
An easy way of doing this is by extending the `FacebookAds\Object\ServerSide\Event` class and implementing the `Esign\ConversionsApi\Contracts\MapsToFacebookPixel` interface on it:
```php
use Esign\ConversionsApi\Contracts\MapsToFacebookPixel;
use Esign\ConversionsApi\Facades\ConversionsApi;
use FacebookAds\Object\ServerSide\ActionSource;
use FacebookAds\Object\ServerSide\Event;

class PurchaseEvent extends Event implements MapsToFacebookPixel
{
    public static function create(): static
    {
        return (new static())
            ->setActionSource(ActionSource::WEBSITE)
            ->setEventName('Purchase')
            ->setEventTime(time())
            ->setEventSourceUrl(request()->fullUrl())
            ->setEventId((string) Str::uuid())
            ->setUserData(ConversionsApi::getUserData());
    }

public function getFacebookPixelEventType(): string
    {
        return 'track';
    }

public function getFacebookPixelEventName(): string
    {
        return $this->getEventName();
    }

public function getFacebookPixelCustomData(): array
    {
        $customData = $this->getCustomData();

return array_filter([
            'currency' => $customData?->getCurrency(),
            'value' => $customData?->getValue(),
        ]);
    }

public function getFacebookPixelEventData(): array
    {
        return array_filter(['eventID' => $this->getEventId()]);
    }
}
```

You may now pass any class that implements the `MapsToFacebookPixel` interface to the view component responsible for tracking Facebook Pixel events:
```php
use FacebookAds\Object\ServerSide\CustomData;
use Illuminate\Support\Str;

$event = PurchaseEvent::create()->setCustomData(
    (new CustomData())->setCurrency('EUR')->setValue(10)
);
```

```blade
<x-conversions-api-facebook-pixel-tracking-event :event="$event" />
```

This will render the following script tag:
```html
<script>
    fbq('track', 'Purchase', {"currency": "EUR", "value": 10}, {"eventID": "ccf928e1-56fd-4376-bee3-dda0d7dbe136"});
</script>
```

To retrieve a list of all events that implement the `MapsToFacebookPixel` interface you may call the `filterFacebookPixelEvents` method:
```blade
@foreach(ConversionsApi::getEvents()->filterFacebookPixelEvents() as $event)
    <x-conversions-api-facebook-pixel-tracking-event :event="$event" />
@endforeach
```

In case you want more control over what's being rendered, you may always use the anonymous component:
```blade
<x-conversions-api::facebook-pixel-tracking-event
    eventType="track"
    eventName="Purchase"
    :customData="[]"
    :eventData="[]"
/>
```

### Google Tag Manager
Before attempting to deduplicate events through GTM make sure to configure your GTM container id and include the necessary scripts:

```env
GOOGLE_TAG_MANAGER_ID=GTM-XXXXXX
```

```blade
<html>
  <head>
    <x-conversions-api-google-tag-manager-head />
    {{-- ... --}}
  </head>
  <body>
    <x-conversions-api-google-tag-manager-body />
    {{-- ... --}}
  </body>
</html>
```

This package comes with a view component that will map all user data from the `ConversionsApi` to dataLayer variables:
```blade
<x-conversions-api-data-layer-user-variable />
```
For example when an email address is set, it will be automatically mapped to a dataLayer variable.
Check the [source](src/View/Components/DataLayerUserDataVariable.php) of the view component to see a list of all possible variables.
```php
ConversionsApi::setUserData(
    (new UserData())->setEmail('john@example.com')
);
```
```js
window.dataLayer.push({"conversionsApiUserEmail": "john@example.com"});
```

Now that your Pixel through GTM is correctly initialized, it's time to send some events.
An easy way of doing this is by extending the `FacebookAds\Object\ServerSide\Event` class and implementing the `Esign\ConversionsApi\Contracts\MapsToDataLayer` interface on it:
```php
use Esign\ConversionsApi\Contracts\MapsToDataLayer;
use Esign\ConversionsApi\Facades\ConversionsApi;
use FacebookAds\Object\ServerSide\ActionSource;
use FacebookAds\Object\ServerSide\Event;

class PurchaseEvent extends Event implements MapsToDataLayer
{
    public static function create(): static
    {
        return (new static())
            ->setActionSource(ActionSource::WEBSITE)
            ->setEventName('Purchase')
            ->setEventTime(time())
            ->setEventSourceUrl(request()->fullUrl())
            ->setEventId((string) Str::uuid())
            ->setUserData(ConversionsApi::getUserData());
    }

public function getDataLayerArguments(): array
    {
        $customData = $this->getCustomData();

return [
            'event' => 'conversionsApiPurchase',
            'conversionsApiPurchaseEventId' => $this->getEventId(),
            'conversionsApiPurchaseCurrency' => $customData?->getCurrency(),
            'conversionsApiPurchaseValue' => $customData?->getValue(),
        ];
    }
}
```

You may now pass any class that implements the `MapsToDataLayer` interface to the view component responsible for tracking Facebook Pixel events:
```php
use FacebookAds\Object\ServerSide\CustomData;
use Illuminate\Support\Str;

$event = PurchaseEvent::create()->setCustomData(
    (new CustomData())->setCurrency('EUR')->setValue(10)
);
```

```blade
<x-conversions-api-data-layer-variable :event="$event" />
```

This will render the following script tag:
```html
<script>
    window.dataLayer.push({
        "event": "conversionsApiPurchase",
        "conversionsApiPurchaseEventId": "e2481afc-5af4-4483-bc4b-33f08e195e3a",
        "conversionsApiPurchaseCurrency": "EUR",
        "conversionsApiPurchaseValue": 120
    });
</script>
```

To retrieve a list of all events that implement the `MapsToDataLayer` interface you may call the `filterDataLayerEvents` method:
```blade
@foreach(ConversionsApi::getEvents()->filterDataLayerEvents() as $event)
    <x-conversions-api-data-layer-variable :event="$event" />
@endforeach
```

In case you want more control over what's being rendered, you may always use the anonymous component:
```blade
<x-conversions-api::data-layer-variable :arguments="[]" />
```

## PageView Events
This package ships with some helpers to track `PageView` events out of the box.
These helpers will automatically send both Conversions API & Facebook Pixel events and provide event deduplication.
> **Note**
> Make sure to always include these view components after you've already looped over any other events currently defined on the ConversionsApi. Including these view components will clear any existing events.

In case you're using the Facebook Pixel directly:
```blade
<x-conversions-api-facebook-pixel-page-view />
```
Or by using Google Tag Manager. The data-layer variable to deduplicate events is called `conversionsApiPageViewEventId`.
```blade
<x-conversions-api-data-layer-page-view />
```

## Troubleshooting
### PageView events are not shown as deduplicated in the test events dashboard
Event deduplication for PageView events should be fine out of the box, since the event name and event id parameters have been provided.
However, when serving your application locally the ip address returned by Laravel's `request()->ip()` will be `127.0.0.1`.
This is different from the ip address sent through Facebook Pixel, causing the Conversions API and Facebook Pixel events to not be deduplicated.
This issue should solve itself once the application will be ran in production.

### Whitelisting Cookies in Laravel
When using ``\App\Http\Middleware\EncryptCookies::class`` in ``\App\Http\Kernel::class``, ensure to whitelist _fbp and _fbc cookies to prevent null values in loading ``DefaultUserData::create()``. Update the $except property in the EncryptCookies middleware as shown below:

```php
<?php

namespace App\Http\Middleware;

use Illuminate\Cookie\Middleware\EncryptCookies as Middleware;

class EncryptCookies extends Middleware
{
    /**
     * The names of the cookies that should not be encrypted.
     *
     * @var array
     */
    protected $except = [
        '_fbp',
        '_fbc'
    ];
}
```

## Testing

```bash
composer test
```

## License

The MIT License (MIT). Please see [License File](LICENSE.md) for more information.

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