Storefront - Need Info on Checkout

Retired Boards Appdev Custom Storefronts
1

I’ve created the checkout using mobile buy SDK. I need a few pieces of info

Checkout Url : https://<DOMAIN_HERE>/7849445154/checkouts/373479122cb24c317fc14bfe000523b7?key=<KEY_VALUE>

  1. What is key_value ?
  2. is there any expiry date and time for the checkout URL?

Sometimes checkout URL is automatically redirected to the Home URL.
Kindly help us with the information.
Thank you