if ( ! isset( $data['optin_status'] ) ) {
    $data['optin_status'] = wp_fusion()->settings->get( 'gh_default_status', 2 );
}

$contact = new \Groundhogg\Contact( $data );

unset( $data['first_name'] );
unset( $data['last_name'] );
unset( $data['email'] );

// Update custom fields

foreach ( $data as $key => $value ) {

    $contact->update_meta( $key, $value );

}