I don't think this tool is sending user_id

[paradite]

Per Google Analytics docs, user_id is required in order to identify a user (to differentiate new user with an existing returning user).

It is also required when sending user_data.

fetch(`https://www.google-analytics.com/mp/collect?measurement_id=${measurement_id}&api_secret=${api_secret}`, {
  method: "POST",
  body: JSON.stringify({
    client_id: 'XXXXXXXXXX.YYYYYYYYYY',
    user_id: "XXX",
    events: [{
      name: 'purchase'
    }],
    user_data: {
      sha256_email_address: yourEmailSha256Variable,
      sha256_phone_number: yourPhoneSha256Variable,
      address: {
        sha256_first_name: yourFirstNameSha256Variable,
        sha256_last_name: yourLastNameSha256Variable,
        sha256_street: yourStreetAddressSha256Variable,
        city: yourCityVariable,
        region: yourRegionVariable,
        postal_code: yourPostalCodeVariable,
        country: yourCountryVariable
      }
    }
  })
});

However, looking at the code, it is only sending client_id, not user_id.

const payload = {
    client_id: this.clientID,
    events: [
        {
            name: eventName,
            params: {
                session_id: this.sessionID,
                ...this.customParams,
            },
        },
    ],
};

Happy to open a PR if you think this issue should be addressed.

[hajeonghun]

@paradite I'm sorry for the delay in response.
Currently, we are only identifying clients. Are you in need of collecting 'user_id' and 'user_data' for user identification?