About live key and test key

I'm developing a payment feature using Toss Billing plugin on Bubble.io. I have some questions on this:
1. If I use live key on dev version, does it charge the money from my card?
2. If I put in live key -> add my card -> replace live key to test key, does my car is still able to use for payment? Or I have to add my card again.

Thank youu!!!
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