Send value to RSS feed to create custom feed

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Okay, I created a post of the confirmation which puts it in the RSS feed automagically.

$my_post = array(
'post_title'    => 'My post',
'post_content'  => $confirmation,
'post_status'   => 'publish',
'post_author'   => $user_id,
'post_category' => array(8,39)
);