button direct to checkout integration

Hello,
I am looking into selling preinscriptions for courses via my webpage. The idea would be to have pricing tables in a page with diferent dates and a button that would automatically add the product (the specific course preinscription) to the cart and skip shop page, product page, cart page, and go straight to checkout.
I found a plugin that would do the job of skiping product and cart page, https://ww.wp.xz.cn/plugins/woocommerce-direct-checkout/
Now I need to configure the button out of the shop page. Can you help me with that¿?

Thank you