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Understand Facebook App Ads Referral URLs

The Facebook Referral URL contains secured campaign metadata about the Facebook ad that directly led to an app install from the Google Play Store. Integration with Google Play Install Referrer provides this campaign metadata. This campaign metadata is encrypted and can be decrypted using a decryption key provided for each app.

The following ad campaign metadata will be provided via Install Referrer:

  • Ad Account ID
  • Adgroup ID
  • Adgroup Name
  • Ad ID
  • Ad Objective Name
  • Ad Campaign Group ID
  • Ad Campaign Group Name
  • Ad Campaign ID
  • Ad Campaign Name

Note: The metadata returned is subject to change.

Before You Start

You need the following:

Implementation

Step 1: Get the Decryption Key

In the App Dashboard under Basic > Settings for your app, scroll down to the Android section. Copy the Install Referrer Decryption Key for use in Step 3.

Example Key

2575590594a9cd809e5bfacf397f8c1ac730dbc38a3e137ecd1ab66591c8c3c9M

Step 2. Set up the Google Play Install Referrer API

Visit Google's Developer Documentation Guide for Install Referral API for the Google Play Store Install Referrer API setup instructions.

The Google Play Install Referrer API returns encrypted data for your app. Because Facebook already provides data in the referrer for some ads, this new encrypted ads data has been appended to the utm_content parameter source field.

Example Encrytped Referrer Data

referrer = {
 utm_content: {
   source: {
       "data": "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",
       "nonce": "b7203c6a6fb633d16e9cf5c1",
   },
   ...
 },
 ...
}

Note: Parameters outside of the encrypted campaign metadata, such as utm_source, are not guaranteed to be included and should not be used as an indication of installs from Facebook.

Step 3. Decrypt Your Data

The data is encrypted with AES-GCM 256bit symmetric key using LibSodium, a standard open-source encryption framework. The encrypted cipher and nonce in this case are HEX-strings, so a hex-to-binary conversion is required before decrypting them.

Example Decryption with PHP

php> $key = "2575590594a9cd809e5bfacf397f8c1ac730dbc38a3e137ecd1ab66591c8c3c9"
php> $cipher = "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";
php> $nonce = "b7203c6a6fb633d16e9cf5c1";
php> $result = PHP\sodium_crypto_aead_aes256gcm_decrypt(PHP\sodium_hex2bin($cipher), '', PHP\sodium_hex2bin($nonce), PHP\sodium_hex2bin($key));
php> echo $result;     // This has the 16 byte tag trimmed
{
   "ad_id":"{ad-id}",
   "adgroup_id":"{ad-group-id}",
   "adgroup_name":"{ad-group-name}",
   "campaign_id":"{campaign-id}",
   "campaign_name":"{campaign-name",
   "campaign_group_id":"{campaign-group-id}",
   "campaign_group_name":"{campaign-group-name}",
   "account_id":"{account-id}",
   "ad_objective_name":"APP_INSTALLS",
}

Note: The decrypted payload will include a 16 byte tag at the end. This is a tag added automatically by libSodium’s AES-GCM encryption, and it can be ignored or trimmed.

Work with a Mobile Measurement Partner or Service Provider

If you are working with a Facebook Mobile Measurement Partner (MMP) or a service provider for reporting and analysis, you can either provide your partner with the decrypted data or the decryption key. If you provide your partner with the decryption key, they can then use the steps in this guide to decrypt the data on your behalf.

Additional Resources