{"componentChunkName":"component---src-templates-markdown-template-jsx","path":"/guides/customer-360/idsync/best-match-strategy/","result":{"data":{"pageMetadata":{"title":"Best Match Strategy","path":"/guides/customer-360/idsync/best-match-strategy/","sourceCode":null,"metadataParent":{"title":"IDSync","path":"/guides/customer-360/idsync/","sourceCode":null,"hasVersionPicker":null,"metadataChildren":[{"title":"IDSync Overview","path":"/guides/customer-360/idsync/introduction/","order":1,"label":null},{"title":"Use Cases for IDSync","path":"/guides/customer-360/idsync/use-cases/","order":2,"label":null},{"title":"Components of IDSync","path":"/guides/customer-360/idsync/components/","order":3,"label":null},{"title":"Store and Organize User Data","path":"/guides/customer-360/idsync/user-data/","order":4,"label":null},{"title":"Identify Users","path":"/guides/customer-360/idsync/identify-users/","order":5,"label":null},{"title":"Default IDSync Configuration","path":"/guides/customer-360/idsync/default-strategy/","order":7,"label":null},{"title":"Profile Conversion Strategy","path":"/guides/customer-360/idsync/profile-conversion-strategy/","order":8,"label":null},{"title":"Profile Link Strategy","path":"/guides/customer-360/idsync/profile-link-strategy/","order":9,"label":null},{"title":"Profile Isolation Strategy","path":"/guides/customer-360/idsync/profile-isolation-strategy/","order":10,"label":null},{"title":"Best Match Strategy","path":"/guides/customer-360/idsync/best-match-strategy/","order":11,"label":null},{"title":"Aliasing","path":"/guides/customer-360/idsync/aliasing/","order":12,"label":null}],"metadataParent":{"title":"Customer 360","path":"/guides/customer-360/","metadataChildren":[{"title":"Overview","path":"/guides/customer-360/overview/","order":0.5,"label":null},{"title":"User Profiles","path":"/guides/customer-360/profiles/","order":1,"label":null},{"title":"Identity Dashboard","path":"/guides/customer-360/identity-dashboard/","order":2,"label":null},{"title":"Identity Resolution Log","path":"/guides/customer-360/identity-resolution-log/","order":3,"label":null},{"title":"Household Reach","path":"/guides/customer-360/household-reach/","order":4,"label":null},{"title":"Calculated Attributes","path":"/guides/customer-360/calculated-attributes/","order":5,"label":null},{"title":"Predictions","path":"/guides/customer-360/predictions/","order":6,"label":null},{"title":"IDSync","path":"/guides/customer-360/idsync/","order":7,"label":null}],"metadataParent":{"title":"Guides","path":"/guides/","metadataChildren":[{"title":"Platform Overview","path":"/guides/platform-overview/","order":0.5,"label":null},{"title":"Getting Started","path":"/guides/getting-started/","order":1,"label":null},{"title":"mParticle Agent","path":"/guides/mparticle-agent/","order":1.5,"label":null},{"title":"Oversight","path":"/guides/oversight/","order":2,"label":null},{"title":"Data Platform","path":"/guides/data-platform/","order":3,"label":null},{"title":"Data Warehouse","path":"/guides/data-warehouse/","order":4,"label":null},{"title":"Customer 360","path":"/guides/customer-360/","order":5,"label":null},{"title":"Analytics","path":"/guides/analytics/","order":6,"label":null},{"title":"Audiences","path":"/guides/audiences/","order":7,"label":null},{"title":"Settings","path":"/guides/settings/","order":8,"label":null},{"title":"Troubleshooting mParticle","path":"/guides/troubleshooting/","order":10,"label":null},{"title":"Default Service Limits","path":"/guides/default-service-limits/","order":11,"label":null},{"title":"Glossary","path":"/guides/glossary/","order":12,"label":null}],"metadataParent":null}}}},"markdownRemark":{"html":"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Unique IDsLogin IDsOn New Known UserOn Logout
NoneNoneN.A.N.A.
\n

\n \n \n \n \n \n \n \n Use cases

\n

The best match strategy does not apply any special business logic. It suits device-centric business models that do not rely on uniquely identifying users. Four general use cases are suited to the best match strategy.

\n\n

\n \n \n \n \n \n \n \n Requests

\n

Since the best match strategy does not support login IDs, there are no login or logout requests, only identify, for identifying a user based on your configured identity priority and the information in the request, and modify for altering an identity for a given MPID.

\n

\n \n \n \n \n \n \n \n Identity flow

\n

Example identity priority:

\n
    \n
  1. Email Address
    2. \n
  2. IDFV
    3. \n
  3. Android ID
    4. \n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
ScenarioInitial ProfileRequestNew Profile
First App Launch
User launches the app and the mParticle SDK		noneIdentify
IDFV: 9876		Profile 1
mParticle ID: 1234
IDFV: 9876
Add additional ID
User provides email address.		Profile 1
mParticle ID: 1234
IDFV: 9876		Identify
Email: ed.hyde@example.com
IDFV: 9876		Profile 1
mParticle ID: 1234
IDFV: 9876
Email: ed.hyde@example.com
User Updates Email
User changes their email address		Profile 1
mParticle ID: 1234
IDFV: 9876
Email: ed.hyde@example.com		Modify
mParticle ID: 1234
Identity Type: email
Old Value: ed.hyde@example.com
New Value: h.jekyll.md@example.com		Profile 1
mParticle ID: 1234
IDFV: 9876
Email: h.jekyll.md@example.com
Shared Device: Second User
A new user provides an email on the same device.		Profile 1
mParticle ID: 1234
IDFV: 9876
Email: h.jekyll.md@example.com		Identify
Email: poole@example.com
IDFV: 9876		Profile 1
mParticle ID: 1234
IDFV: 9876
Email: h.jekyll.md@example.com
Email: poole@example.com

Since the Best Match strategy doesn’t enforce uniqueness of IDs, this profile now has 2 email lookups.
Second User: New Device InitializenoneIdentify
Android ID: 8765		Profile 2
mParticle ID: 2345
Android ID: 8765
Second User: New Device Provide EmailProfile 2
mParticle ID: 2345
Android ID: 8765		Identify
Android ID: 8765
Email: poole@example.com		Profile 1
mParticle ID: 1234
IDFV: 9876
Android ID: 8765
Email: h.jekyll.md@example.com
Email: poole@example.com

Now that we have the email, it’s higher rank in the Identity Priority means we’re back to profile 1. A new Android ID lookup has been added for profile 1.
","frontmatter":{"title":"Best Match Strategy","order":11,"seoTitle":null,"seoDescription":null},"parent":{"__typename":"File","modifiedTime":"October 12, 2026"}}},"pageContext":{"slug":"/guides/customer-360/idsync/best-match-strategy/"}},"staticQueryHashes":["2950460867"]}