PayPal Error: Security header is not valid (Code 10002)

This error, seen when attempting to checkout using LifterLMS PayPal, is generally the result of having miscopied credentials from PayPal into the LifterLMS PayPal Checkout Settings screen or using LIVE credentials in Sandbox mode or vice versa.

This error can be easily resolved by updating your credentials and ensuring they are correct.

However, if your credentials are correct and you’re still having issues, PayPal document the error as having the following causes:

  • Account locked – The user account is locked
  • Authentication/Authorization Failed – Account is locked or inactive
  • Internal Error – Account is locked or inactive
  • Internal Error – Internal Error
  • Authentication/Authorization Failed – Account is not verified
  • Authentication/Authorization Failed – API access is disabled for this account
  • Authentication/Authorization Failed – Client certificate is disabled
  • Authentication/Authorization Failed – Internal Error
  • Authentication/Authorization Failed – This call is not defined in the database!
  • Authentication/Authorization Failed – Token is not valid
  • Receiving Limit exceeded – You’ve exceeded the receiving limit. This transaction can’t be completed
  • Restricted account – Account is restricted

Source: https://www.paypal-knowledge.com/infocenter/index?page=content&id=FAQ1030&actp=LIST

If you’ve confirmed that your credentials are correct and you’re still having issues please contact PayPal for further assistance.

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