Hi,
So the moment I activate the salon plugin its conflicts with WP Mail SMTP in the authorisation part which stop emails being sent.
Under authorisation in WP Mail SMTP once salon plugin is activated it states:
Warning: json_decode() expects parameter 1 to be string, array given in /home/biz25674/public_html/lillibuffs.co.uk/wp-content/plugins/salon-booking-system/src/SLN/Third/google-api-php-client/src/Google/Auth/OAuth2.php on line 183
Fatal error: Uncaught Google_Auth_Exception: Could not json decode the token in /home/biz25674/public_html/lillibuffs.co.uk/wp-content/plugins/salon-booking-system/src/SLN/Third/google-api-php-client/src/Google/Auth/OAuth2.php:185 Stack trace: #0 /home/biz25674/public_html/lillibuffs.co.uk/wp-content/plugins/salon-booking-system/src/SLN/Third/google-api-php-client/src/Google/Client.php(217): Google_Auth_OAuth2->setAccessToken(NULL) #1 /home/biz25674/public_html/lillibuffs.co.uk/wp-content/plugins/wp-mail-smtp/src/Providers/Gmail/Auth.php(121): Google_Client->setAccessToken(Array) #2 /home/biz25674/public_html/lillibuffs.co.uk/wp-content/plugins/wp-mail-smtp/src/Providers/Gmail/Auth.php(53): WPMailSMTP\Providers\Gmail\Auth->get_client() #3 /home/biz25674/public_html/lillibuffs.co.uk/wp-content/plugins/wp-mail-smtp/src/Providers/Gmail/Options.php(138): WPMailSMTP\Providers\Gmail\Auth->__construct() #4 /home/biz25674/public_html/lillibuffs.co.uk/wp-content/plugins/wp-mail-smtp/src/Providers/Gmail/Options.php(121): WPMailSMTP in /home/biz25674/public_html/lillibuffs.co.uk/wp-content/plugins/salon-booking-system/src/SLN/Third/google-api-php-client/src/Google/Auth/OAuth2.php on line 185