I appreciate how simple your plugin is and thank you for offering this service. Just added the extension plugin to add payments to the booking.  Created a product and added it to the WooCommerce product section as instructed in the YouTube video.  I even marked the box that said "Add to Cart Mark this option if you want to add products to cart on Appointment creation." Then hit save.  

Upon testing, when I click on Submit, there is no redirect to the cart as it shows on the video.  But if I go to the cart page, the product is in there.  So it almost works as shown, it's just not directing to the cart when I submit, just says, "Done" at the bottom of the page.     Please help as quickly as possible.