Add Custom Claims to Passport 8 / Laravel 6

AccessToken.php

<?php

namespace App\Passport;

use App\User;
use Lcobucci\JWT\Builder;
use Lcobucci\JWT\Signer\Key;
use League\OAuth2\Server\CryptKey;
use Lcobucci\JWT\Signer\Rsa\Sha256;
use Laravel\Passport\Bridge\AccessToken as BaseToken;

class AccessToken extends BaseToken {

	private $privateKey;

	/**
	 * Generate a string representation from the access token
	 */
	public function __toString() {
		return (string) $this->convertToJWT( $this->privateKey );
	}

	/**
	 * Set the private key used to encrypt this access token.
	 */
	public function setPrivateKey( CryptKey $privateKey ) {
		$this->privateKey = $privateKey;
	}

	public function convertToJWT( CryptKey $privateKey ) {
		$builder = new Builder();
		$builder->permittedFor( $this->getClient()->getIdentifier() )
		        ->identifiedBy( $this->getIdentifier(), true )
		        ->issuedAt( time() )
		        ->canOnlyBeUsedAfter( time() )
		        ->expiresAt( $this->getExpiryDateTime()->getTimestamp() )
		        ->relatedTo( $this->getUserIdentifier() )
		        ->withClaim( 'iss', 'http://localhost:8080/' )
		        ->withClaim( 'scopes', $this->getScopes() );

		if ( $user = User::find( $this->getUserIdentifier() ) ) {
			$builder
				->withClaim( 'uid', $user->id );
			// Include additional user claims for user here
		}

		return $builder
			->getToken( new Sha256(), new Key( $privateKey->getKeyPath(), $privateKey->getPassPhrase() ) );
	}
}

AccessTokenRepository.php

<?php

namespace App\Repositories;

use App\Passport\AccessToken;
use Laravel\Passport\Bridge\AccessTokenRepository as BaseRepository;
use League\OAuth2\Server\Entities\ClientEntityInterface;

class AccessTokenRepository extends BaseRepository {

	public function getNewToken( ClientEntityInterface $clientEntity, array $scopes, $userIdentifier = null ) {
		return new AccessToken( $userIdentifier, $scopes, $clientEntity );
	}
}

app.php

// located in config/app.php

'providers' => [
       ...
       
	/*
	* Application Service Providers...
	*/
      
	App\Providers\PassportServiceProvider::class,
 ],

PassportServiceProvider.php

<?php

namespace App\Providers;

use App\Repositories\AccessTokenRepository;
use Laravel\Passport\Bridge\ClientRepository;
use Laravel\Passport\Bridge\ScopeRepository;
use League\OAuth2\Server\AuthorizationServer;

class PassportServiceProvider extends \Laravel\Passport\PassportServiceProvider {
  
	public function makeAuthorizationServer() {
    
		return new AuthorizationServer(
			$this->app->make( ClientRepository::class ),
			$this->app->make( AccessTokenRepository::class ),
			$this->app->make( ScopeRepository::class ),
			$this->makeCryptKey( 'private' ),
			app( 'encrypter' )->getKey()
		);
	}

}