自动化cron发送邮件到linkedin公司

Question

I'm trying to send a new post to a linkedin company (automation via cron).

1- retrieve the post to share from mysql

2- send the post

3- update the database with ID of the post

** I want to do it all 3 in 1 php script **

but with linkedin API it seems we have to get a token and set the token...

first I did with github.com/zoonman/linkedin-api-php-client

$linkedin = new LinkedIn\Client( 'clientID', 'client SECRET' );
$linkedin->setRedirectUrl('callback.php');
$linkedin->setApiHeaders([ 'Content-Type' => 'application/json', 'x-li-format' => 'json', 'X-Restli-Protocol-Version' => '2.0.0', 'x-li-src' => 'msdk' ]);

 $loginUrl = $linkedin->getLoginUrl();
 echo $loginUrl.'<hr>';

I went to the given URL, linkedin returned me with a token and expiresAt...

after I do

$accessToken = new LinkedIn\AccessToken($linkedin_token, $linkedin_tokenExpire);
                    $linkedin->setAccessToken($accessToken);

                    $linkedinShare = $linkedin->post(
                        'companies/stubfeed/shares',
                        [
                            'content' => [
                                'title' => 'share_title',
                                'description' => 'share_description',
                                'submitted-url' => 'share_stubfeed_url',
                                'submitted-image-url' => 'share_img_url',
                            ],
                            'visibility' => [
                                'code' => 'anyone'
                            ]
                        ]
                    );
                    var_dump($linkedinShare);

But I get an error

LinkedIn\Exception: Client error: `POST https://api.linkedin.com/v1/companies/stubfeed/shares` resulted in a `401 Unauthorized` response: { "errorCode": 0, "message": "Unable to verify access token", "requestId": "0AGNS6DQ64", "status": 401, "times (truncated...) in /vendor/zoonman/linkedin-api-php-client/src/Exception.php on line 68

What I'm I missing ? Is it possible to automate this process via cron ?

I am able (and it's working) to do it with few others API like twitter, but I'm stuck here...

Thanks