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I am setting up Google Analytics transaction tracking and I plan to pass "userID" as a transaction id. While site usually has one-time purchases, there are sometimes users who purchase same product (subscription) more than once. Are there any downsides to this and should I reconsider this?

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up vote 1 down vote accepted

Providing that you're only passing non-personal, anonymous information as covered here, there shouldn't be any downsides.

This could help identify repeat purchases by individuals, as well as provide helpful information about conversions paths, such as which devices they're using to purchase your products with, as covered here by Google.

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This is what I expected, the only real problem that I could think of is that for some reason new transactions with re-used IDs (for same users) won't register. Is that a valid concernt or not in this case? This is my last question (also updated main one). – phoops Mar 16 '14 at 23:11
Sorry, had to rollback your question as adding new questions impacts answers - others can see the question in your comment above though. I'm not sure why you would think so, each time the tracking code is run, Google Analytics will record it. – dan Mar 16 '14 at 23:19
Thank you. Marking this as an answer. – phoops Mar 16 '14 at 23:38
You're welcome, good luck. – dan Mar 16 '14 at 23:39

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