Gmail API authorization

Hey,

I’m trying to make the gmail api work on my website with postman but can’t figured out how to :

I have the api ID / secret key with the correct javascript / redirection uri set.

When I try to validate the google authorization from the link on the postman settings page, I am redirected to the google validation button but when I click on it, i’m redirected back to the wordpress/postman settings page with the same button to authorize from google.

The postman connectivity test tell me that everything is fine with the smtp.gmail.com , all ports are opened and SMTPS, SMTP-STARTTLS and HTTPS.

Any clue ?

Thanks by advance for your answers 🙂

PS : Here is the diagnostic test :

OS: Linux vpsxxxxxx.ovh.net 3.16.0-4-amd64 #1 SMP Debian 3.16.36-1+deb8u2 (2016-10-19) x86_64
PHP: Linux 5.6.27-0+deb8u1 C
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=Yes, zlib_encode=Yes
WordPress: 4.7 fr_FR UTF-8
WordPress Theme: ShareLock
WordPress Plugins: Pinpoint Booking System PRO, Advanced Custom Fields PRO, Cookie Monster, GA Google Analytics, Postman SMTP, WPML Multilingual CMS, TinyMCE Advanced, UpdraftPlus – Backup/Restore, W3 Total Cache, Wordfence Security, Yoast SEO
WordPress wp_mail Filter(s): wp_staticize_emoji_for_email
WordPress wp_mail_from Filter(s): wordfence::fixWPMailFromAddress
Postman: 1.7.2
Postman Sender Domain (Envelope|Message): gmail.com | gmail.com
Postman Prevent Message Sender Override (Email|Name): No | No
Postman Active Transport: Valeur par défaut (smtp:none:none://localhost:25)
Postman Active Transport Status (Ready|Connected): No | No
Postman Selected Transport: API Gmail (https:oauth2://www.googleapis.com:443)
Postman Selected Transport Status (Ready|Connected): No | Yes
Postman Deliveries (Success|Fail): 0 | 0