If you get error code 10002 with the message 10002: Security Header Invalid, you have incorrect API credentials. Check that the account that will receive payments was used to generate the API credentials. If you’re using PayPal’s Sandbox environment, you must generate API credentials from within the Sandbox business account rather than a Live account.
If you’ve changed no settings in Event Espresso > Payment settings then that mean that PayPal has restricted your account. In which case you will need to contact PayPal merchant account support.
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