Disable Payment Gateway For Specific Product Category

//DISABLE COD PAYMENT FOR SPECIFIC PRODUCT CATEGORY
function unset_payment_cod_for_online_trening( $available_gateways ) {
    global $woocommerce;
    $unset = false;
    $category_ids = array( 109 );
    foreach ( $woocommerce->cart->cart_contents as $key => $values ) {
        $terms = get_the_terms( $values['product_id'], 'product_cat' );    
        foreach ( $terms as $term ) {        
            if ( in_array( $term->term_id, $category_ids ) ) {
                $unset = true;
                break;
            }
        }
    }
        if ( $unset == true ) unset( $available_gateways['cod'] );
        return $available_gateways;
}
add_action( 'woocommerce_available_payment_gateways', 'unset_payment_cod_for_online_trening', 5 );