To increase the match rate with Google Customer Match, which identity namespaces can be used?

The ability to increase the match rate with Google Customer Match hinges on the correct identity namespaces. The answer that highlights GAID (Google Advertising ID), IDFA (Identifier for Advertisers), and phone_sha256_e.164 as viable namespaces is particularly relevant.

GAID and IDFA are unique identifiers for mobile devices, which enable Google to target users effectively across different platforms and apps. These identifiers are critical for enabling accurate tracking and targeting, ensuring that the advertisements reach the intended audience.

The inclusion of phone_sha256_e.164 in this combination is also significant. This format refers to a hashed version of phone numbers that are formatted according to the E.164 standard. This hashing ensures that personal data is protected while still allowing for effective matching against Google’s databases.

Overall, this combination of identifiers maximizes the potential for matching user profiles within Google’s ecosystem, thus conforming to best practices for user identification and data privacy while leveraging multiple means of verifying user identities.