Trying WooCommerce REST API and then reverting to regular API

regular-wc-api.php

<?php
// Convert ThriveCart order to WooCommerce order.
// ThriveCart order data is passed via ThriveCart Webhook into $_POST.
// By Damien Carbery, damien@damiencarbery.com, https://www.damiencarbery.com
//
// $Id: tc-to-wc-order.php 4726 2019-06-07 11:10:43Z damien $


// Avoid warnings about element not being set.
function get_post_parameter( $key, $default ) {
	if ( array_key_exists( $key, $_POST ) ) {
		return $_POST[ $key ];
	}
	else {
		return $default;
	}
}


function create_vip_order() {
	
	global $address, $tc_to_wc_products, $tc_product_id;

  $payment_method = 'bacs';

  // User check/creation code from: https://gist.github.com/stormwild/7f914183fc18458f6ab78e055538dcf0 (and https://stackoverflow.com/a/35304031/8605943)
  $default_password = wp_generate_password();

  $customer_id = null;
  if ( $user = get_user_by( 'login', $address[ 'email' ] ) ) {
	  $customer_id = $user->ID;
  }
  else {
	  $customer_id = wp_insert_user( array(
					'user_login' => $address[ 'email' ],
					'user_pass'  => $default_password,
					'user_email' => $address[ 'email' ],
					'role'       => 'customer',
				) );
  }

  // Now we create the order
  $order = wc_create_order( array('customer_id' => $customer_id) );

  // The add_product() function below is located in /plugins/woocommerce/includes/abstracts/abstract_wc_order.php
  $order->add_product( wc_get_product( $tc_to_wc_products[ $tc_product_id ] ), 1); // This is an existing SIMPLE product
  $order->set_address( $address, 'billing' );
  
  
  // This block copied from: https://stackoverflow.com/a/55437588/8605943
  $order->set_created_via( 'programatically' );
  $order->set_customer_id( $customer_id );
  $order->set_currency( get_woocommerce_currency() );
  $order->set_prices_include_tax( 'yes' === get_option( 'woocommerce_prices_include_tax' ) );
  $gateways = WC()->payment_gateways->get_available_payment_gateways();
  $order->set_payment_method( isset( $gateways[ $payment_method ] ) ? $gateways[ $payment_method ] : $payment_method );

  $order->calculate_totals();
  $order_id = $order->save();
  $status_change = $order->update_status('wc-completed', 'Imported order', TRUE);
  
  echo "<p>Order: <strong>$order_id</strong></p>";
  echo "<p>Status: <strong>", $order->get_status(), "</strong></p>";
}


header('HTTP/1.1 200 OK');
header('Content-Type: text/plain');

// Return 2xx status for HEAD request to satisfy ThriveCart webhook check.
if ( 'HEAD' == $_SERVER['REQUEST_METHOD'] ) {
    // Don't do anything.
}
else {
	define('WP_USE_THEMES', false);

	/** Loads the WordPress Environment */
	require( dirname( __FILE__ ) . '/wp-blog-header.php' );

	// Basic prerequisites.
	if ( ( 'order.success' != get_post_parameter( 'event', '' ) ) ||
		   ( '-redacted-' != get_post_parameter( 'thrivecart_account', '' ) ) ||  // In
		   ( '-redacted-' != get_post_parameter( 'thrivecart_secret', '' ) ) ) {
		//header( 'HTTP/1.1 400 Bad Request' );
		echo( '<p>Invalid "event", or "thrivecart_account" or "thrivecart_secret".</p>' );
	}
	else {
		// Extract the required data from $_POST so that an order can be created.
		$tc_product_id = get_post_parameter( 'base_product', 0 );
		$customer = get_post_parameter( 'customer', array() );
		//var_export( $customer );
		$address = array(
			  'first_name' => $customer[ 'first_name' ],
			  'last_name'  => $customer[ 'last_name' ],
			  'email'      => $customer[ 'email' ],
			  'address_1'  => $customer[ 'address' ][ 'line1' ],
			  'city'       => $customer[ 'address' ][ 'city' ],
			  'state'      => 'NA',
			  'postcode'   => $customer[ 'address' ][ 'zip' ],
			  'country'    => $customer[ 'address' ][ 'country' ],
		);

		// Map ThriveCart products to WooCommerce Sensi products.
		$tc_to_wc_products = array( 
			5  => 5962, // ULTIMATE Online Screenwriting Course
			16 => 75576, //  How to Write a Great Novel – Online Course
			17 => 194105, // How to Make Money Blogging – Online Course
			15 => 5960,  // Write The Great American TV Script – Online
			18 => 208689,  // Write the Hit Romance & Erotic Novel – Online
		);

		// Ensure that the product has an equivalent in WooCommerce.
		if ( array_key_exists( $tc_product_id, $tc_to_wc_products ) ) {
			create_vip_order();
		}
	}
}

wc-rest-api-failed-test.php

<?php
$request_url = 'http://localhost/storefront/wp-json/wc/v3/orders/';
$consumer_key = 'ck_-redacted-';
$consumer_secret = 'cs_-redacted-';

$credentials = array();
$credentials = array( 'username: admin', 'password: -redacted-', 'consumer_key'  );

$curl_handle = curl_init( );
curl_setopt( $curl_handle, CURLOPT_URL, $request_url );
curl_setopt( $curl_handle, CURLOPT_CONNECTTIMEOUT, 0 );
curl_setopt( $curl_handle, CURLOPT_TIMEOUT, 15 );
curl_setopt( $curl_handle, CURLOPT_HTTPHEADER, $credentials  );
curl_setopt( $curl_handle, CURLOPT_USERPWD, $consumer_key . ':' . $consumer_secret); 
curl_setopt( $curl_handle, CURLOPT_RETURNTRANSFER, TRUE );
$JsonResponse = curl_exec( $curl_handle );
$http_code = curl_getinfo( $curl_handle );
if ( 200 == $http_code[ 'http_code' ] ) {
	echo $JsonResponse, "\n";
}
else {
	echo 'ERROR: <pre>', var_export( $JsonResponse, true ), "</pre>\n";
}

/*
Returns:
ERROR: <pre>'{"code":"woocommerce_rest_cannot_view","message":"Sorry, you cannot list resources.","data":{"status":401}}'</pre>
*/