Relevant for those products that have an unsubscribe page. If the user no longer wants to receive emails, they can be unsubscribed via the API endpoint, where source_id can be:

• 8 – if the user was unsubscribed due to account blocking or deletion;
• 9 – if the user unsubscribed from the product settings on their own.

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Please note that it is impossible to unsubscribe from system emails.

Also, the following methods to unsubscribe can be used:

• addBySettings – if the user unsubscribed on your product's settings page;
• addByClient – if, for some reason, you unsubscribed the user in your system.

$projectId = 1;
$user = $sendios->user->getByEmail('test@example.com', $projectId);
$unsub = $sendios->unsub->addBySettings($user);
//$unsub = $sendios->unsub->addByClient($user);