Tutorial: Measure iOS Ads conversions

Step 3: Initiate on-device conversion measurement using Google Analytics

Now that you can collect users' email addresses and phone numbers and your app has the Google Analytics for Firebase SDK, you can use the two to start measuring conversions.

Call the API

Call the conversion measurement API with the consented email address or phone number from Step 1, which is used for ads conversion measurement, without allowing any personally identifiable information to leave the user device.

There are two ways to initiate measurement:

• Using credentials
• Using hashed credentials

Use email address or phone number

import FirebaseAnalytics

// ...
// If you're using an email address....
Analytics.initiateOnDeviceConversionMeasurement(emailAddress: "example@gmail.com")
// If you're using a phone number....
Analytics.initiateOnDeviceConversionMeasurement(phoneNumber: "+15555555555")

@import FirebaseAnalytics;

// ...
// If you're using an email address....
[FIRAnalytics initiateOnDeviceConversionMeasurementWithEmailAddress:@"example@gmail.com"];
// If you're using a phone number....
[FIRAnalytics initiateOnDeviceConversionMeasurementWithPhoneNumber:@"+15555555555"];

using Firebase.Analytics;

// ...
// If you're using an email address....
FirebaseAnalytics.InitiateOnDeviceConversionMeasurementWithEmailAddress("example@gmail.com");
// If you're using a phone number....
FirebaseAnalytics.InitiateOnDeviceConversionMeasurementWithPhoneNumber("+15555555555");

Use a hashed email address or phone number

The API will accept email addresses and phone numbers hashed with SHA256. You can maintain control of your user's data by performing the hashing in your code before making calls to the SDK.

To use hashed credentials, normalize addresses and numbers, hash them with SHA256, then call the API.

Normalize email addresses and phone numbers

For email addresses, the Google Analytics API assumes that a particular normalization is performed before SHA256 is applied, so follow these steps to normalize your data:

1. Convert the entire email address to lowercase.

2. If the email address ends in domain @googlemail.com, replace the @googlemail.com domain with @gmail.com.

3. For addresses ending in domain @gmail.com (including those modified in the previous step):

   1. Remove all periods from the username portion.

   2. Make the following substitutions in the username portion:

      • For letters I or i, or digit 1, substitute letter l
      • For digit 0, substitute letter o
      • For digit 2, substitute letter z
      • For digit 5, substitute letter s

For example, after normalization:

• an.email.user0125@googlemail.com becomes anemlluserolzs@gmail.com
• CAPSUSER0125@provider.net becomes capsuser0125@provider.net

For phone numbers, numbers must already be in E.164 format (that is, prefix with +, 1-3 digits for country code, max 12 digits for subscriber number) prior to hashing with SHA256.

Call the API with hashed credentials

import FirebaseAnalytics

// ...
// If you're using an email address....
Analytics.initiateOnDeviceConversionMeasurement(hashedEmailAddress: hashedEmailAddress)
// If you're using a phone number....
Analytics.initiateOnDeviceConversionMeasurement(hashedPhoneNumber: hashedPhoneNumber)

@import FirebaseAnalytics;

// ...
// If you're using an email address....
[FIRAnalytics initiateOnDeviceConversionMeasurementWithHashedEmailAddress:hashedEmailAddress];
// If you're using a phone number....
[FIRAnalytics initiateOnDeviceConversionMeasurementWithHashedPhoneNumber:hashedPhoneNumber];

using Firebase.Analytics;

// ...
// If you're using an email address....
FirebaseAnalytics.InitiateOnDeviceConversionMeasurementWithHashedEmailAddress(hashedEmailAddress);
// If you're using a phone number....
FirebaseAnalytics.InitiateOnDeviceConversionMeasurementWithHashedPhoneNumber(hashedPhoneNumber);

Verify with Xcode debug logs (optional)

If you enabled debug mode, after calling the initiate measurement API, ensure that a message like the following log message appears in the Xcode debug console:

9.0.0 - [FirebaseAnalytics][I-ACS023225] Initiated on-device conversion measurement

In Firebase 9.6.0 or later, if you enabled debug mode and included the -DebugOnDeviceConversionMeasurement launch argument, then calling the initiateOnDeviceConversionMeasurement() API will simulate a match.

9.6.0 - [FirebaseAnalytics][I-ACS023229] On-device conversion measurement found a match

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