appwrite/app/sdks/client-flutter/docs/examples/teams/create-membership.md

import 'package:appwrite/appwrite.dart';

void main() { // Init SDK
  Client client = Client();
  Teams teams = Teams(client);

  client
    .setEndpoint('https://[HOSTNAME_OR_IP]/v1') // Your API Endpoint
    .setProject('5df5acd0d48c2') // Your project ID
  ;

  Future result = teams.createMembership(
    teamId: '[TEAM_ID]',
    email: 'email@example.com',
    roles: [],
    url: 'https://example.com',
  );

  result
    .then((response) {
      print(response);
    }).catchError((error) {
      print(error.response);
  });
}