Snipcart accounts have two modes: the live one your store should use in production, and a test mode that's completely isolated for learning, experimenting, and testing without taking payments or impacting merchant operations. It's like having two separate Snipcart accounts, but more convenient switching back and forth.
The Snipcart plugin can be configured to operate in either mode. Once you've added both sets of API keys, the Test Mode setting will make it easy to switch between live and test mode.
There are a few things to be aware of when you're working with the Snipcart plugin in test mode: