Disable WooCommerce REST API authentication: Override WooCommerce capability check so that all REST API queries are allowed. https://www.damiencarbery.com/2019/07/disable-woocommerce-rest-api-authentication/

allow-wc-rest-api-queries-with-ip-check.php

<?php
/*
Plugin Name: Disable WooCommerce REST API authentication
Plugin URI: https://www.damiencarbery.com/2019/07/disable-woocommerce-rest-api-authentication/
Description: Override WooCommerce capability check so that all REST API queries from specified IP are allowed 
Author: Damien Carbery
Version: 0.1

*/

add_filter( 'woocommerce_rest_check_permissions', 'dcwd_allow_rest_api_queries', 10, 4 ); 
function dcwd_allow_rest_api_queries( $permission, $context, $zero, $object ) {
	// Optionally limit permitted queries to different contexts.
	/*if ( 'read' != $context ) {
		return $permission;
	}*/
	// Write the parameters to the error log (or debug.log file) to see what requests are being accessed.
	//error_log( sprintf( 'Permission: %s, Context: %s; Object: %s', var_export( $permission, true ), $context, var_export( $object, true ) ) );

  // Disable authentication for specific IP addresses.
  $permitted_ips = array('12.34.56.78', '87.65.43.21');
  if (in_array($_SERVER['REMOTE_ADDR'], $permitted_ips)) {
    return true;  // Allow all queries.
  }
  
  return $permission;
}

allow-wc-rest-api-queries.php

<?php
/*
Plugin Name: Disable WooCommerce REST API authentication
Plugin URI: https://www.damiencarbery.com/2019/07/disable-woocommerce-rest-api-authentication/
Description: Override WooCommerce capability check so that all REST API queries are allowed.
Author: Damien Carbery
Version: 0.1

*/

add_filter( 'woocommerce_rest_check_permissions', 'dcwd_allow_rest_api_queries', 10, 4 ); 
function dcwd_allow_rest_api_queries( $permission, $context, $zero, $object ) {
	// Optionally limit permitted queries to different contexts.
	/*if ( 'read' != $context ) {
		return $permission;
	}*/
	// Write the parameters to the error log (or debug.log file) to see what requests are being accessed.
	//error_log( sprintf( 'Permission: %s, Context: %s; Object: %s', var_export( $permission, true ), $context, var_export( $object, true ) ) );

	return true;  // Allow all queries.
}