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Edit File: SimSwapGnpHandler.php

<?php

namespace Vonage\Client\Credentials\Handler;

use Psr\Http\Message\RequestInterface;
use Vonage\Client;
use Vonage\Client\APIResource;
use Vonage\Client\Credentials\CredentialsInterface;
use Vonage\Client\Credentials\Gnp;

/**
 * This handler is for Vonage GNP APIs that require the CAMARA standard OAuth Flow
 */
class SimSwapGnpHandler extends AbstractHandler
{
    use Client\ClientAwareTrait;
    use Client\ScopeAwareTrait;

protected ?string $baseUrl = null;
    protected ?string $tokenUrl = null;

public function getBaseUrl(): ?string
    {
        return $this->baseUrl;
    }

public function setBaseUrl(?string $baseUrl): SimSwapGnpHandler
    {
        $this->baseUrl = $baseUrl;
        return $this;
    }

public function getTokenUrl(): ?string
    {
        return $this->tokenUrl;
    }

public function setTokenUrl(?string $tokenUrl): SimSwapGnpHandler
    {
        $this->tokenUrl = $tokenUrl;
        return $this;
    }

public string $token;

public function __invoke(RequestInterface $request, CredentialsInterface $credentials): RequestInterface
    {
        /** @var Gnp $credentials  */
        $credentials = $this->extract(Gnp::class, $credentials);
        $msisdn = $credentials->getMsisdn();

$api = new APIResource();
        $api->setAuthHandlers(new GnpKeypairHandler());
        $api->setClient($this->getClient());
        $api->setBaseUrl($this->getBaseUrl());

$response = $api->submit([
            'login_hint' => $msisdn,
            'scope' => $this->getScope()
        ]);

$decoded = json_decode($response, true, 512, JSON_THROW_ON_ERROR);

$authReqId = $decoded['auth_req_id'];

// CAMARA Access Token
        $api->setBaseUrl($this->getTokenUrl());
        $response = $api->submit([
            'grant_type' => 'urn:openid:params:grant-type:ciba',
            'auth_req_id' => $authReqId
        ]);

$decoded = json_decode($response, true, 512, JSON_THROW_ON_ERROR);

$token = $decoded['access_token'];

// Add CAMARA Access Token to request and return to make API call
        return $request->withHeader('Authorization', 'Bearer ' . $token);
    }
}

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