I am using the following snippet to disable a specific payment method in Woocommerce, based on the total value of the cart.

add_filter( 'woocommerce_available_payment_gateways', 'show_hide_payment_methods' );
function show_hide_payment_methods( $available_gateways ) {
    if ( ( WC()->cart->total >= 1000 ) ) {
        if ( isset($available_gateways['cod']) ) {
            unset($available_gateways['cod']);
        }
    }
    return $available_gateways;
}