Webiny\Component\OAuth2\OAuth2::requestAccessToken PHP Method

requestAccessToken() public method

You can call this method only on the OAuth redirect_uri page or else the request will fail.
public requestAccessToken ( ) : string
return string Access token.
    public function requestAccessToken()
    {
        $tokenUrl = $this->processUrl($this->server->getAccessTokenUrl());
        $accessToken = $this->instance->requestAccessToken($tokenUrl);
        $this->instance->setAccessToken($accessToken);
        return $accessToken;
    }