How to manually update newsletter member’s field in Contao 3

 

// id of the member we wish to update

$memberId = 2;

// array of newsletter channel's id

$arrNewsletter = array("1");

$objMember = \MemberModel::findByPk($memberId);

// first sync the newsletter

$objNewsletter = new \Newsletter();

$objNewsletter->synchronize($arrNewsletter, $objMember)

// after syncing update the member model

$objMember->newsletter = $arrNewsletter;  
$objMember->save();