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Security header is not valid using express checkout

Thread began 5/29/2013 10:35 am by Jon Cunningham | Last modified 5/29/2013 1:24 pm by Jon Cunningham | 3416 views | 11 replies

5/29/2013 11:02 amJason ByrnesWebAssist

the security header is invalid error means there is a problem with the API Credentials.

There are 3 places the API Credentials are added for Express checkout:
1 on the checkout page in the Authenticate transaction for PayPal Express

2 on the pp_confirrn page in the get payer profile and the process transaction with paypal express, make sure to change the API credentials in all 3 places.

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