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SKAdNetwork Solution guide

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Gray Goldstein
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  • Advertisers
  • Ad Networks

At a glance: Attributing app installs using SKAdnetwork.

5754SKAdNetworkFlow_us-en.jpg

SKAdNetwork

iOS 14 guidance 

  • Guidance updated February 7, 2021:
    • AppsFlyer SDK V6.0.3+ is iOS 14 ready. 
    • We expect that starting iOS 14.5+ (to be released) you’ll be required to ask users for their permission to track them across apps and websites owned by other companies. This means is that starting iOS 14.5 ATT consent is required to access IDFA. 
    • If you advertise using Apple Search Ads (ASA), adopt V6.1.3+ and adjust your reporting processes in accordance with our ASA bulletin. 
  • General iOS 14 guidance:
    • AppsFlyer LTV attribution continues to operate unchanged compared to iOS 13. 
    • Implement the AppsFlyer SKAdNetwork Solution as described in this article. 
    • Make sure that your ad network partners have SKAdNetwork integration with AppsFlyer.
    • Use AppsFlyer SKAdNetwork simulation to get a better understanding of how ATT will impact your attribution.
    • Before iOS V14.5 it is not mandatory to display the ATT prompt before collecting IDFA 
  • AppsFlyer iOS SDK V5.4:
    • LTV attribution continues to operate unchanged compared to iOS 13. 
    • Adopt the latest version of the AppsFlyer SDK V6 going forward. 

SKAdNetwork infrastructure, part of iOS by Apple, helps advertisers measure campaign success while maintaining user privacy. The SKAdNetwork infrastructure operates without IDFA or other advertising ID. Consequently, there is no need for user consent to implement the solution. 

Related reading

Definitions

  • SDK: AppsFlyer iOS SDK V6.X integrated into an app.
  • SKAdNetwork Infrastructure or Infrastructure: Refers to the attribution functions embedded in iOS 14, as defined by Apple. 
  • SKAdNetwork Solution or Solution: SDK, Infrastructure, and AppsFlyer platform working together. The Solution provides advertisers and ad networks with LTV data via dashboard analytics, reports, and postbacks. 
  • Measurement window has a set duration, default of 24 hours, starting with the first app open. 
  • Conversion value is the measure of user quality set by the app. Usually, the AppsFlyer SDK does this for you. However, if you set the conversion value then use Custom conversion value.

This article describes the relevant characteristics of the Infrastructure, the Solution, and the available configurations. 

Apple SKAdNetwork Infrastructure basics

Characteristic Description
Prerequisites

To enable the use of SKAdNetwork in the app:
Supported
  • Devices having:
    • iOS 11-13 support SKAdNetwork V1 (installs only)
    • iOS 14+ SKAdNetwork V2+ (with conversion value)
  • App-to-app attribution
Not supported
  • Mobile web
  • Campaign numbering is restricted to the range 1-100; means 100 unique values per ad network per app.
    • Ad networks are required to provide AppsFlyer with their campaign ID and name. This reflects in AppsFlyer dashboards and reports. 
    • Ad networks may further restrict this; so check with each ad network
  • Organic installs
Provides
  •  SKAdNetwork attributes using the following Apple attribution model: 
    • The user, clicks an ad, within 30 days installs (downloads the app), and thereafter within 60 days opens the app for the first time. 
    • The user, views an ad, within 24 hours installs (downloads the app), and thereafter within 60 days opens the app for the first time. 
    • Starting with SKAdNetwork V2.2, click-through attribution takes priority over view-through attribution. The SKAdNetwork version depends on the user's iOS version. 
  • Aggregated attribution with campaign-level granularity
  • Postbacks:
    • Sent to the attributed ad network by the OS layer of the iOS device
    • 24-72 hours after install
    • No postback for organic installs
Privacy thresholds 

Why is the conversion value missing in some postbacks? 

According to Apple, the postback won't include the conversion value nor the source app ID if doing so contravenes Apple privacy threshold limits. 

SKAdNetwork Solution

The solution offers measurement modes as follow:

  • AppsFlyer measurement mode: Requires adoption of SDK V6+ and that you set in the user interface your measurement requirements. This is described in detail in the sections that follow. The logic required to set the conversion value is embedded in the SDK and doesn't require any coding in the app. 
  • Custom measurement mode: Requires adoptions of SDK V6+. You need to code the logic required to set the conversion value in the app. The SDK does not do this. On receipt of postbacks, AppsFlyer decodes them using your Custom conversion mapping. If you are not yet familiar with the different measurement modes, consider the examples in this article and contrast them with those in the Custom conversion mapping article. 

Solution principles and flow

To overcome the functional and structural limitations of the SKAdNetwork infrastructure, the Solution takes into consideration the characteristics in the table that follows.

Characteristic Description
Data collection
  • For the advertiser, SKAdNetwork postbacks are collected from multiple ad networks.
  • Advertisers don't need to integrate individually with each ad network—a complex and tedious task.
Data validation
  • Ensures postbacks are signed by Apple; this reduces the chances of postback manipulation.
  • Uses the transaction ID field to validate that postbacks are unique.
Data enrichment
  • Enriches SKAdNetwork postback data with other data points to provide complete ROI analysis. For example, geo resolution using the iOS IP address, campaign name provided by the ad network, and so on. 
  • Data points include impressions, clicks, cost, organic traffic, and more.
Data delivery

Enriched SKAdNetwork data is available using the following: 
Seamless integration
  • Full encapsulation enables a near-zero effort by the advertiser via the app settings page.
  • No coding required. The app requires AppsFlyer iOS SDK V6.0+. 
  • Includes support for expected changes by Apple in the SKAdNetwork infrastructure.
Agility 

Advertisers can change measurement configurations as needed in the dashboard.


SKAdNetwork attribution flow

SKAdNetwork_-_Activity_diagram_with_swimlanes_example__1_.png

  1. Advertiser sets SKAdNetwork measurement settings in the Platform.
  2. After the user opens the app for the first time, Platform instructs SDK how to calculate the conversion value using the current configuration set by Advertiser.
  3. During the Measurement Window SDK updates the conversion value for each measurable user action.
  4. 24-48 hours after the most recent conversion value update, iOS sends the postback to ad network.
  5. Ad network forwards the postback to AppsFlyer.
  6. AppsFlyer validates and decodes the conversion value. Decoded data is:
    • Recorded and attributed before being made available in AppsFlyer via dashboards, reports, and APIs.
    • Sent via a postback to the Ad network to enable campaign optimization.

More about timers

Performance measurement

You measure user quality by selecting a measurment mode.

Conversion value

  • Calculated according to the user-quality measurement setting existing at the time the user opens the app for the first time
  • Updated by the SDK after each measurable user action that occurs in the app itself or reported by server-to-server (S2S) API. 
  • A numerical value from 0-63
  • User actions occurring after the expiry of the measurement window are not recorded. 
  • Sent once per install, by iOS 24-48 hours, after the most recent conversion value update
  • In most cases, iOS populate the conversion value in the postback if Apple determines that this doesn't contravene Apple privacy threshold limitations. 

The Solution supports the following user-quality measurement types:

  • [Default] Revenue: Total revenue generated by the user.
  • Conversion: Record the unique in-app events (1-6) the user performs.
  • Engagement: The number of times (0-63) the user performs a specific in-app event.

The sections that follow, contain descriptions of the metrics available and measurement examples. Use these to understand the capabilities and limitations of SKAdNetwork attribution and identify the measurement that will provide you with the greatest indication of user quality. Advertisers select the measurement type as needed via the dashboard. 

Metric

 Formula/type 
Installs Count
Clicks Count
Impressions Count

Click-to-install rate

 Installs / Clicks *100 
Cost Campaign cost 
Effective cost per install (eCPI) Cost / Installs *100
Converted users

Count of unique users performing a designated measurement event:

  • Revenue event (always af_skad_revenue)
  • Conversion Event
  • Engagement event
Converted users rate

Converted users / Installs * 100
Effective cost per action (eCPA)

Cost / Unique users performing a designated event
Metrics always available (irrespective of measurement type)


User-quality measurement types

User-quality measurement type settings
Measurement type Description
[Default] Revenue

Revenue generated during the Measurement Window

Settings:

  • Value range: 0-63
  • Conversion value translation:
    • Conversion value units are translated to USD using one of the following conversion factors: $0.01, $1.00, $10.00
    • Revenue amounts in the dashboard and raw-data are converted to the app-specific currency using the current exchange rate. 

Metrics:

    • Revenue
    • ROI
    • ROAS
    • ARPU: Revenue/users installing the app
    • Rate of users converting: Users making a purchase/users installing the app
    • eCPA

Consideration:

In the app, foreign currency amounts are translated to USD which are converted to conversion units. Fractions of a conversion value unit are rounded up to complete units. For Example, EUR 10, after translation using the current exchange rate is USD 11.25. If the conversion value unit rate selected is $1=1 unit, this is 11.25 units which is rounded up to 12 conversion value units. 
Conversion

In-app event performed at one or more times during the Measurement Window

Settings:

  • Number of events supported: 1-6
  • Select in-app events to measure from the drop-down list.
  • Designate one in-app event as the Conversion Event. This event is used to trigger the loyal user metric and to count unique users. 

Metrics per in-app event:

    • Count of users performing an event
    • Conversion rate: Users performing the Conversion Event/users installing the app
    • eCPA

Example of user counts:

  • Completed registration
  • Made a purchase
  • Reached a game level

Clarification! Use conversion measurement to count if a user performed an event. To count how many times a user performs an event use engagement measurement.
Engagement

Number of times the user performed a specified in-app event during the Measurement Window

For this measurement type adopt SDK version V6.2+.  Verify with the developer that they have implemented the required version. 

Settings: 

  • Select an in-app event from the drop-down list.
  • The in-app selection is also designated as the Conversion Event.
  • Value range: 0-63

Metrics for the in-app event:

    • Count of users performing the event
    • Average number of events per user
    • Conversion rate
    • eCPA

Examples:

  • Measure the number of times:
    • a user opened the app
    • the user viewed an a ad

Measurement type examples

Example A: Revenue measurement
Factor Remarks
Scenario
  • 20 users install the app and perform the following purchases:
    • 9 users each make a purchase of $10
    • 5 users each make a purchase of $5
    • 1 user makes a purchase of $1, then $3, then $5, and finally $1. In total $10. 
  • Cost data provided by API from the ad network: $30
SKAdNetwork Attribution Configuration
  • Select measurement type: revenue
  • Set conversion factor: 1 conversion unit = $1
  • Designated conversion event: af_purchase (always)
Selected metrics  Revenue related metrics available
  • Installs: 20
  • Revenue: $125
  • Conversions:15
  • ARPU: $6.25
  • ROI: 316%
Number of raw data rows per report 

Raw data reports are available via Data Locker

  • Device postbacks: 20 rows
  • Installs: 20 rows
  • In-app events: 15 rows. Note! The user making multiple purchases is represented by a single row of $10. 
Developer considerations

Events carrying revenue are recognized
Example B: Conversion measurement
Factor Remarks
Example
  • 5 users (A-E) install the app
  • They perform 0-3 different in-app events as depicted in the table
  • Cost data provided by API from the ad network: $30
  in-app-1 in-app-2 in-app-3
User A Performed Performed -
User B Performed - Performed
User C Performed Performed -
User D Performed Performed -
User E - - -
In-app events performed by users
SKAdNetwork Attribution Configuration

Select measurement type: Conversion

  • Select in-app events: in-app-1, in-app-2, in-app-3
  • Designated Conversion Event: in-app 1
Selected metrics
Metric  App  in-app-1 in-app -2 in-app- 3
Installs 5      
Conversions 4      
Unique users   4 3 1
eCPA $ 7.5      
In-app related metrics available

Note! Because the designated Conversion Event is in-app 1, the value 4 is used to calculate app-level metrics and for in-app-1 metrics. 
 

Raw data reports are available via Data Locker

  • Device postbacks:5 rows
  • Installs: 5 rows
  • In-app events: 8 rows
Developer considerations
  • Make sure you send in-app events users perform.
  • SKAdNetwork Solution disregards event values (except in relation to revenue measurement.
Example C: Engagement measurement
Factor Remarks
Example

5 users install the app and open the app the number of times listed in the table. 

  Number of times the event is performed
User A 63
User B 10
User C 5
User D 1
User E -
App opens
SKAdNetwork Attribution Configuration
  • Select measurement type: Engagement
  • Designated conversion event: af_app_opened Note! You can use any event available. 
Selected metrics

Sample metrics available

  • Installs: 5
  • Conversions: 4
  • Sessions: 79 
Number of raw data rows per report 

Raw data reports are available via Data Locker

  • Device postbacks:5 rows
  • Installs: 5 rows
  • In-app events: 79 rows; a row is equivalent to a single session
Developer considerations

On each occasion the user performs the selected engagement event: send the in-app event. SKAdNetwork counts the number of times you send the event. 

Procedures

Configuring SKAdNetwork attribution

To configure SKAdNetwork attribution:

  1. In AppsFlyer, go to Configuration > SKAdNetwork Settings.
    The SKAdNetwork settings page opens.
  2. [Optional advanced setting] If you want to report events by S2S, turn Record in-app events sent by server-to-server API.
  3.  Select a measurement type from one of the following:
    • Revenue: Select a unit-to-USD rate to translate revenue units to USD. There are up to 63 revenue units. The maximum measurable revenue is the unit-to-USD rate X 63. Options available: $0.01, $1.00, $10.00
      For example, $10 X 63 = $630, $1 X 63 = $63, $0.01 X 63 = $0.63.
    • Conversion:
      1. Select up to 6 in-app events performed by users.
      2. From the in-app events selected, select one as the conversion event. This event is used to calculate the converted users metric at the app level. 
    • Engagement: Select an in-app event whose occurrences are counted.
  4. Verify that SKAdNetwork measurement is on. Note! If off, the SDK does not call iOS SKAdNetwork functions like registerAppForAdNewtorkAttribution, updateConversionValue.
  5. Click Save changes.
    Measurement is active. Users opening the app for the first time are measured using these settings. SKAdNetwork attribution data updates in the dashboard 48-72 hours after the first app open. 

Disable SKAdNetwork measurement

To turn off  SKAdNetwork measurement:

  1. In AppsFlyer, go to Configuration > SKAdNetwork Settings.
  2. Turn off SKAdNetwork measurement. 
    Amongst other things, the SDK stops calling SKAdNetwork functions like registerAppForAdNewtorkAttribution, updateConversionValue.
  3. Click Save changes.

Report events by server-to-server API

SKAdNetwork_-_S2S__2_.png

Both the SDK and server-to-server API (S2S) can send in-app events to AppsFlyer servers. 

The S2S flow is as follows:

  • An event occurs related to the user in the advertiser's servers. The app may be open or closed at this time. 
  • Advertiser servers report the event to AppsFlyer by S2S.
  • AppsFlyer calculates the updated conversion value and then: 
    • If the app is open on the user device: the SDK is notified of the updated value. The SDK updates the iOS conversion value on the device.
    • If the app isn't open on the user device: the server waits until the app is opened to notify the SDK of the conversion value. This must occur before the expiry of the measurement window. If notification fails, the event is disregarded.

SDK version required

  • Adopt SDK V6.2.1+ in the app. Note! No addtional action is required by the developer. 

To implement in-app event sending by server-to-server API:

  1. [One-time] Enable in-app event recording sent by server-to-server API:
    1. In AppsFlyer, go to Configuration > SKAdNetwork settings.
    2. Turn on Record in-app events sent by server-to-server API.
  2. Send events by S2S. 

Additional SKAdNetwork information

Reporting options

Report name  Type Enriched by AppsFlyer Delivery method

Aggregate performance report of install, in-app events, and revenue. The data is similar to that found in the SKAdNetwork dashboard.

Aggregated

Yes

API 
Aggregated postback data. SKAdNetwork postbacks aggregated to the greatest level of granularity possible.  Aggregated No API 

AFpremimum.jpg

SKAdNetwork raw-data reports via Data Locker  (with examples). Reports available:

  • Postbacks sent by iOS
  • Installs
  • Redownloads
  • In-app events
 Raw data Yes Data Locker

SKAdNetwork Solution implementation checklist

No. Action Description Responsibility
1  Prepare Marketer, Developer
2 Configure 

In AppsFlyer, configure the SKAdNetwork solution

 Marketer
3 Prepare the app

Migrate the app to AppsFlyer V6 SDK

  • No change to app logic nor to app code is required.
  • The Solution relies on in-app events to set the conversion value. Send in-app events in the usual manner. No Solution specific testing is required. 
  • See developer considerations for specific measurement scenarios.
  • Submit the app to the App Store
  • No SKAdNetwork registration or process is required in the app store.
 Developer
4 Partner integrations 

Ad network partners must integrate with AppsFlyer using SKAdNetwork integration. Note! AppsFlyer SKAdNetwork simulation contains the data of all your partners irrespective of their current integration status. This won't be the case for the live data reported by SKAdNetwork postbacks.
 

In relation to partners running your campaigns complete the following as required: 

Non-SRNs:

  1. Verify that the partner has an AppsFlyer SKAdNetwork capability badge.
  2. Verify that your in-app event names are mapped to partner in-app event names. 

Facebook:

 Marketer
SKAdNetwork implementation checklist

Timing from app install until dashboard update

Timer element Description Range (hours)
Measurement window
  • [Default] Measurement window countdown timer: 24 hours
  • During the measurement window, AppsFlyer sets the conversion value
  • The countdown begins with the first app open
 24
SKAdNetwork timer 
  • Countdown timer: 24 hours
  • Each time the conversion value is set, the timer is reset. Means start counting down from 24 hours.
  • Maximum value of measurement window + SKAdNetwork timer: 48 hours.
 24–48
SKAdNetwork random delay timer Random postback delay time: 0–24 hours 0-24
AppsFlyer processing Postbacks received on a given day are processed at the end of the day starting at 00:01 on the following day. The data is available 8 hours later on the next day. Average delay of 20 hours. For example, a postback received on Monday is processed on Tuesday. The dashboard updates by 08:00 UTC.  8-32
Summary The average time elapsed from app open to data in the dashboard: 68 hours.  32–104

Organic metrics in the context of SKAdNewtork

Organic metrics in the SKAdNetwork dashboard are calculated using the following mechanism:

  • Apple SKAdNetwork sends postbacks relating to users who install after engaging with a media source. This provides the non-organic metrics. 
  • AppsFlyer LTV dashboard contains metrics of all installs irrespective of source. 
  • Using this data organic metrics are calculated as A-B where: 
    • A = Total of all users based on the LTV overview dashboard
    • B = Non-organic users as reported by SKAdNetwork postbacks

Caveat relating to Apple Search Ads: Installs brought by Apple Search Ads in the LTV dashboard are non-organic. However, in the context of SKAdNetwork, they form part of the organic metric. 

Traits and limitations

SKAdNetwork Solution traits and limitations
Trait Remarks 
Ad network access Ad networks are provided with postbacks
Agency access Not available
Agency transparency N/A
Timezone UTC
Currency  USD
Organic data Based on SDK event data. For example, organic install metrics are calculated as follows: Data of all installs reported by the SDK less non-organic installs reported by SKAdNetworks.
Non-organic data Based on SKAdNetwork postbacks
Data freshness

Daily. Due to SKAdNetwork timing issues on average 68 hours (~3 days) after app open. Range: 32-104 hours. 
Historical data

Earliest date, availability of iOS 14 (September 16, 2020)
Team member access Available. According to account permissions
App clips App clips are attributed to organic in the SKAdNetwork dashboard. Use the Overview dashboard to view invocation media sources.

SKAdNetwork integrated partners

Partner list

Partner having SKAdNetwork integration
Partner name Logo Enriches postback with ...
IP address Campaign ID or name Adset ID or name
Appier Yes    
Applovin Yes Yes  
TikTok for Business No Yes Yes
Chartboost Yes    
CrossAudience      
CrossInstall, a Twitter Company Yes Yes Yes
Curate      
Dataseat Yes Yes Yes
Facebook      
Feedmob      
ironSource Yes    
Lifestreet Yes    
Liftoff Yes Yes Yes
Mintegral International Limited Yes Yes Yes
Moloco Yes    
Smadex Yes Yes Yes
Tapjoy Yes    
Snapchat      
Twitter      
Unicorn Yes    
Unity Ads Yes Yes Yes
Vungle Yes    

Sending postbacks to integrated partners

AppsFlyer sends integrated partners postbacks relating to SKAdNetwork attribution. Take note of the various options and requirements in the table that follows

Subject Description

Transaction ID sharing

Action required: Check with the integrated partner if they require the transaction ID and configure the setting accordingly.

AppsFlyer sends the ad network partner attributed with the install postbacks. The postbacks contain information relating to the install and the associated in-app event data of actions performed by the user during the measurement window.

Postbacks can be sent with or without the SKAdNetwork transaction ID. Consider that sharing the transaction ID with the partner could enable them to decode the Conversion Value. 

Transaction ID sharing

Advertisers or agencies enable transaction ID sharing as follows: In AppsFlyer, go to Configuration > Integrated Partners > select a partner > Integration tab > Data sharing.

In-app event mapping verification
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