Order Rules
You can use order rules to enforce conditions that the buyer must fulfill to continue checking out an order. To enable order rules,
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Open the Global Menu (  ) and navigate to Control Panel → System Settings. ) and navigate to Control Panel → System Settings.
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Go to Commerce → Orders and choose Order Rules from the left menu. 
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Check the Enabled checkbox. 
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Click Update. 
Now, you can configure order rules by opening the Global Menu ( ) and navigating to Commerce → Order Rules. There are two order rules available out-of-the-box.
) and navigating to Commerce → Order Rules. There are two order rules available out-of-the-box.