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The short answer: the key you type in the Playground stays only in the memory of the open page. It is not saved, it never goes in the address, and it is wiped when you leave the page. Even so, use a sandbox_ key to practise: writes are simulated and never charge.
What happens to the key
| Question | Answer |
| Where does it stay? | Only in the memory of the page you have open. |
| Is it saved? | No. |
| Does it go in the page address? | Never. |
| What if I reload or change page? | It is wiped, and you type it again. |
| Does it appear in the generated code? | No. The code always shows the placeholder YOUR_API_KEY, which you replace with your key in your program. |
| Is it kept in the history? | No. The history keeps only the request and the response status. |
sandbox_ or prod_
| sandbox_ key | prod_ key | |
| Reads | Real account data | Real account data |
| Writes | Simulated | Change the account |
| Charges | Never | Yes, within the key spending limit |
The Playground only accepts keys starting with sandbox_ or prod_. The difference between the two modes is explained in Sandbox and Production.
The warning for prod_ keys
If you type a prod_ key, the page shows a warning and only sends the request once you tick "I understand that this request changes the real account". That is deliberate: one extra click beats a domain renewed or an invoice paid by mistake.
| A sandbox_ key also reads real data from your account. Look after it as carefully as a prod_ key. And type the key only in the "API key" field: in a header, the page refuses it. |
| On a shared computer, close the tab when you finish. If the key is exposed, revoke it straight away on the API page in Meu MozOut and create another: what to do, in the right order. |
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No sandbox_ key yet? Create one in Meu MozOut, on the API page. Open the API page |
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