Updating Google Contacts via API shows success in response yet creates duplicate records

Question

I'm coming across this strange behavior where when utilizing the batch processing requests for UPDATING existing contacts in Google Contacts, I'm finding despite coming back as a success, it creates duplicate records.

It definitely did NOT do this throughout my development and testing, only recently. And the only difference I can ascertain is that now I'm working with rather large data sets - a few thousand contacts instead of just a hundred or so.

Here's the raw XML going over the wire for two contacts, both of which were duplicated: http://pastebin.com/diSFzkeu

Any ideas?

Answer 1

Oversight on my part. My groupId wasn't set and it was picking up identical customers from previous tests that I had deleted and were sitting in the deleted (other contacts) folder and restoring them.