You cloned the Integration branch to your local environment and Imported the database dump from Integration. You performed composer install and bin/magento setup:install.
While placing an order using PayPal Express, the following error occurs:
PayPal gateway has rejected request. Security header is not valid (#10002: Security error). What Is the cause of this error?
Paypal gateway has rejected request, Security header is not valid (#10002: Security error).
What is the cause of this error?
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