NopCommerce Product Plugins like BuyNow Button display in product and category page. Using BuyNow Button , customer directly redirect on checkout page for purchase product. so customer not require to click "Add To Cart" and Go to Shopping Cart Page.
If Product is require to select attribute , that time customer redirect to Product Page otherwise he is redirect on checkout page.
Using "BuyNow" button , customer not require to click on "Add To Cart" for add product to shopping cart and not require to go on shopping card page for checkout. so using this plugin customer's take save time and freedom for unnecessary click and flow.
Currently "BuyNow" nopcommerce plugin support 3.70 , 3.80 , 3.90 , 4.0 Version , if you will require it for another version , i will do it. please send me mail to email@example.com if any query or issue, freely please send me mail on firstname.lastname@example.org