If you're going to play in the sandbox, you need to get new API credentials from your sandbox account to enter into your store.
Then to go live again you'll need to get your live API credentials and put those back into your store again.
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18 Aug 2010, 11:42 AM #2
Sensei
- Join Date
- Jan 2004
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- 66,443
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Re: PayPal Express error 10002 security header not valid
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