You can track the user related information using external user ID and/or user attributes. For that, you have to add userExternalId and setUserAttributes to Reteno Flutter.

Adding External User ID

External user ID is an ID you have assigned to a user in your system (external for 'Reteno').
You can add these in Reteno Flutter using the following method:

import 'package:reteno_plugin/reteno.dart';

final reteno = Reteno();
reteno.setUserAttributes(
  userExternalId: 'USER_ID',
  user: userInfo,
);

When to send your user ID to eSputnik >

Adding User Attributes

User attributes define the information you collect about contacts in your user base. For example, phone number, email address, language preference, geographic location.

You can add user attributes using the following method:

import 'package:reteno_plugin/reteno.dart';

final reteno = Reteno();
reteno.setUserAttributes(
  userExternalId: 'USER_ID',
  user: userInfo,
);

Structure of the RetenoUser object:

class RetenoUser {
  RetenoUser({
    this.subscriptionKeys,
    this.userAttributes,
    this.groupNamesExclude,
    this.groupNamesInclude,
  });

  final UserAttributes? userAttributes;
  final List<String>? subscriptionKeys;
  final List<String>? groupNamesInclude;
  final List<String>? groupNamesExclude;
}

class UserAttributes {
  UserAttributes({
    this.lastName,
    this.firstName,
    this.address,
    this.email,
    this.fields,
    this.languageCode,
    this.phone,
    this.timeZone,
  });
  final String? phone;
  final String? email;
  final String? firstName;
  final String? lastName;
  final String? languageCode;
  final String? timeZone;
  final Address? address;
  final List<UserCustomField>? fields;
}

class Address {
  Address({
    this.address,
    this.postcode,
    this.region,
    this.town,
  });
  final String? region;
  final String? town;
  final String? address;
  final String? postcode;
}

class UserCustomField {
  UserCustomField({
    required this.key,
    this.value,
  });
  final String key;
  final String? value;
}

📘
Note
key
Custom fields variables. Details >
phone
We use Google's libphonenumber library for phone number validation. Send phone numbers in the E164 format. A request with an invalid phone number will not be transmitted. You can validate phone numbers by the link.
languageCode
Data about language in RFC 5646 format. Primary language subtag in ISO 639-1 format is required. Example: de-AT
timeZone
Item from TZ database. Example: Europe/Kyiv

Anonymous User Attributes

Available for reteno_plugin starting from version 1.1.0
Reteno plugin allows tracking anonymous user attributes (no externalUserId required). To set user attributes without externalUserId use method setAnonymousUserAttributes():

Reteno.setAnonymousUserAttributes(AnonymousUserAttributes attributes);
**AnonymousUserAttributes** model:
```dart
class AnonymousUserAttributes {
  AnonymousUserAttributes({
    this.lastName,
    this.firstName,
    this.address,
    this.fields,
    this.languageCode,
    this.timeZone,
  });
  final String? firstName;
  final String? lastName;
  final String? languageCode;
  final String? timeZone;
  final Address? address;
  final List<UserCustomField>? fields;
}

📘
Note
You can't provide anonymous user attributes with phone or/and email. For that purpose use setUserAttributes() method with externalUserId