Paypal says this...
Error code: 10002
Short/Long Message:
Authentication/Authorization Failed - Username/Password is incorrect
Correcting This Error:
This error can be caused by an incorrect API username, an incorrect API password, or an invalid API signature. Make sure that all three of these values are correct. For your security, PayPal does not report exactly which of these three values might be in error.
And be certain you have PayPal Express set for 'Live' NOT 'Sandbox'
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