To reduce redundant GDPR messages for your users,Sync consentacross multiple apps. When a user makes a consent decision in a consent-syncing
enabled app, this choice is stored using a consent sync identifier you provide.
That consent decision automatically applies across all other apps that share the
same consent sync identifier. Only Google uses this identifier to store and
retrieve a user's consent decision.
This guide covers syncing GDPR consent from the User Messaging Platform
(UMP) SDK in your mobile app.
Enable consent syncing for eligible apps in thePrivacy & Messagingtab of
the Ad Manager UI.
Set the consent sync identifier
Across the apps where you're able to identify the user, provide the consent sync
ID to the UMP SDK. If your app doesn't have a user identifier, use other
identifiers to identify the user across apps, such as
theIdentifier for Vendor (IDFV).
Set the consent sync ID on theUMPConsentRequestParametersobject:
Swift
letparameters=RequestParameters()// Example using IDFV to identify the user across apps.parameters.consentSyncID=UIDevice.current.identifierForVendor?.uuidString
UMPRequestParameters*parameters=[[UMPRequestParametersalloc]init];// Example using IDFV to identify the user across apps.parameters.consentSyncID=[[[UIDevicecurrentDevice]identifierForVendor]UUIDString];
The identifier you provide must uniquely identify the user across all of your
apps where consent is being synced. Hash or encrypt the identifier to prevent
sending personally identifiable information (PII) to Google.
The provided ID must meet the following requirements:
Constructed as a UUID string or matches regular expression^[0-9a-zA-Z+.=\/_\-$,{}]{22,150}$.
A minimum of 22 characters.
A maximum of 150 characters.
The following are examples of correct consent sync IDs:
12JD92JD8078S8J29SDOAKC0EF230337
12jd92jd8078s8j29sdoakc0ef230337
12Jd92jD8078s8j29sDoakc0ef230337
123e4567-e89b-12d3-a456-426614174000
Failure to meet the requirements results in the consent sync ID not being set
and the UMP SDK logging a warning to the console
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-11-17 UTC."],[],[]]
