docs: add flex-run-enviornment configuration value change for cyberso…

…urce

README.rst

@@ -59,6 +59,7 @@ You will need to modify the ``ECOMMERCE_PAYMENT_PROCESSORS`` parameter to config
         flex_shared_secret_key: SET-ME-PLEASE
         soap_api_url: https://ics2wstest.ic3.com/commerce/1.x/transactionProcessor/CyberSourceTransaction_1.140.wsdl
         transaction_key: SET-ME-PLEASE
+        flex-run-environment: cybersource.environment.sandbox
       paypal:
         cancel_checkout_path: /checkout/cancel-checkout/
         client_id: SET-ME-PLEASE
@@ -81,6 +82,8 @@ To enable the `Cybersource <https://cybersource.com>`__ payment processor, two k
 
 The ``merchant_id`` setting corresponds to your Merchant ID.
 
+If you are running in production, you need to change the ``flex-run-environment`` value in the configuration file as well. You should change the ``flex-run-environment`` value to ``cybersource.environment.production``
+
 Operations
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