WordPress custom plugin that uses woocommerce enabled payment gateway for payment [closed]

Ok, it seems to me that there are two different solutions you can try based on preference.

Option #1 would be to add a subdomain to your existing domain and basically set up a landing page for that one product. This way, you would be able to set up a separate Woocommerce on that subdomain and install a plugin like WooCommerce Quick Checkout to bypass the product page and cart page and go straight to checkout.

Option #2 would be to add that same plugin WooCommerce Quick Checkout on your existing site and create a page for that product. This may be the easier of the two options. The plugin can be found here: https://www.woothemes.com/products/quick-checkout/

Hope this helps.