Notifications?

Hey, Use below snippet.
make sure Settings > General and the field ‘Email Address’ is filled or it won’t work.
You’re right, this should be in plugin’s core.

/**
 * WP Referral Code
 * Send admin notification email when a new user registers using a referral code.
 *
 * @param int           $new_user_id      ID of newly registered user.
 * @param int           $referrer_user_id ID of referring user.
 * @param string        $ref_code         Referral code used.
 */
function wrc_notify_admin_on_referral_signup( $new_user_id, $referrer_user_id, $ref_code ) {
	// Get admin email
	$admin_email = get_option('admin_email');

	if (!$admin_email) {
		return; // Exit if no admin email is set
	}

	// Get user data
	$new_user = get_userdata($new_user_id);
	$referrer = get_userdata($referrer_user_id);

	// Email subject
	$subject = 'New User Registration via Referral';

	// Email message
	$message = "Hello Admin,\n\n";
	$message .= "A new user has registered using a referral code:\n\n";
	$message .= "New User: ({$new_user->user_email})\n";
	$message .= "Referred by: ({$referrer->user_email})\n";
	$message .= "Referral Code Used: {$ref_code}\n\n";
	$message .= "This email was sent from " . get_bloginfo('name');

	// Send email to admin
	wp_mail($admin_email, $subject, $message);
}

// Hook the function to the referral action
add_action('wp_referral_code_after_refer_submitted', 'wrc_notify_admin_on_referral_signup', 10, 3);

No problem, smart move! Let me know if I should mark this as resolved.