After you add or update tags to support purchase-detail reports, you can use Google Tag Assistant to validate the tags.
To use Google Tag Assistant: In a Google Chrome browser, visit the Chrome Web Store and install Google Tag Assistant . (Learn more about using Google Tag Assistant .)
Tag Assistant will:
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Check the syntax of the purchase-details variable. For example, if you accidently define two IDs for a single product, or specify the wrong data type for a field, Tag Assistant will display an error.
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Provide a preview of the data that's collected by the tag.
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Perform checks on other variables within each tag