I don't have an e-commerce store, but I do send my readers to my Eventbrite events quite often and it would be great to track conversions from email to cart to completed sale.
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I have gotten this 400 HTTP error on every email send for the last few weeks... the emails seem to be going out regardless, so I haven't been too worried about it. I'm not using any APIs, this is directly on the CC website.
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