Disable Credit Card

functions.php

<?php
/** 
 * Disable credit card gateway if the total order exceeds $3,000.
 */
function danieldo_filter_gateways($gateways){
    global $woocommerce;

    // Check if the total cart amount is more than $3,000.
    if( $woocommerce->cart->cart_contents_total >= 3000.00 ) {
        // If it is, remove the gateway.
        unset($gateways['gateway_name']);

    }

    return $gateways;
}

add_filter('woocommerce_available_payment_gateways','danieldo_filter_gateways',1);