If a customer converts from an AdWords ad and revisits the confirmation page to find information about their order, you definitely don’t want that page load getting counted as a new conversion. Now, order IDs can be used to help ensure a conversion isn’t counted more than once.
Tuesday, it was announced that advertisers now can edit their conversion tags to capture an order ID, such as a confirmation number, order number and so on. When a customer revisits that conversion page from the same device they converted on, AdWords will filter out the duplicate.
There are a few things you’ll have to do get this going:
The instructions for adding the code to the conversion tracking tag are available on this AdWords support page.
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