Cancelling orders in OpenCart
Changing the order status has no effect on product stock. You will have to make that change manually.
- Log into OpenCart as an administrator.
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On the Dashboard in the left sidebar, click Sales, and then click Installer:
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Find the order that the user requested to be cancelled and click the View button:
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Scroll all the way down to the Add Order History section. Change the Order Status option from Pending to Canceled:

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Click Add History to save the changes to Order Status: