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:

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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?
A. A new encryption key has been created on the setup:install action.
B. The folder var/session has no write permissions for the web server user.
C. PayPal Sandbox API credentials are not valid for the local environment.
D. The PHP extension mcrypt has not been installed locally.

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