James Koster

A big UX mistake on many eCommerce web sites is hiding access to the cart. After adding a product to the cart the visitors next logical step is to complete the purchase. Don’t frustrate your customers by making them search for the cart button!
This plugin adds a sitewide tab that displays the number of products in the cart. Clicking the tab or adding a product to the cart from a shop page will reveal the cart contents with a link to the checkout.
There are options in the Customizer to control the display.
Please feel free to contribute on <a href="https://github.com/jameskoster/woocommerce-cart-tab" rel="nofollow ugc">github</a>.

WooCommerce Cart Tab

Adds an offscreen cart to all pages on your site and a fixed tab that displays the number of products in the cart. Adding a product to the cart or cli …

Tiago Mano

Prevent a product from being added to the cart if the stock is reserved (Pending Payment). Normally, WooCommerce allows to add the product and only gives the error of out of stock in the checkout.

Better Management Reserved Stock – WooCommerce

Prevent a product from being added to the cart if the stock is reserved - Pending Payment.

WooCommerce Cart Tab vs Better Management Reserved Stock – WooCommerce