Login by Passport Facebook by nestJs framework

I’m trying to build a login by Facebook through API endpoint ( My first time ) for mainly a mobile APP using NestJs framework and passport lib

I have followed this article here but I don’t know what next?! also when accessing the endpoint just says not authorized!

I need to register a user if not exist and login if it exists

My code so far ( FB strategy )

import { Injectable } from "@nestjs/common";
import { use } from "passport";
import { UsersService } from "../routes/users/users.service";
import PassportFacebookToken = require("passport-facebook-token");

@Injectable()
export class FacebookStrategy {
  constructor(
    private readonly userService: UsersService,
  ) {
    this.init();
  }
  init() {
    use(
      new PassportFacebookToken(
        {
          clientID: '',
          clientSecret: '',
          fbGraphVersion: 'v3.0',
        },
        async (
          accessToken: string,
          refreshToken: string,
          profile: any,
          done: any,
        ) => {
          const user = await this.userService.create(
            {
                username: profile.displayName,
                email: profile.emails[0].value,
                picture: profile.photos[0].value,

            },
          );
          return done(null, user);
        },
      ),
    );
  }
}

Service:

async create(
  user: Partial<UserDTO>
): Promise<UserDTO> {
  let userExist: UserDTO = await this.userRepository.findOne({ where: { username: user.username } });

  if (userExist) {
    throw new HttpException('User already exists', HttpStatus.BAD_REQUEST);
  }

  let createdUser = this.userRepository.create(user);
  return (await this.userRepository.save(createdUser));
}

Controller

@UseGuards(AuthGuard('facebook-token'))  
@Get('facebook')
async getTokenAfterFacebookSignIn(
    @Req() req: any
) {
    // return this
}