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When some customer order items using paypal express or authorize.net, they got “transaction decline” error. But payment and order processed.
So the customer order again.
But payment 2 times.
The “transaction decline” error occurred but the order is processed.
How can I do this?
My magento version is 1.4.2.0.
I think Magento 1.4 had some issues with duplicate orders. See here
Upgrading to the current version should fix your problem.
Download latest version
How to upgrade Magento