Hi,
Watson Assistant is GDPR compliant, the anonymous user id is used for a few things of which one important one is billing.
If your client want to delete a certain visitor's data they can use the data in the user id in conjuction with the following
https://cloud.ibm.com/docs/assistant?topic=assistant-information-security
Please note, IBM Watson Assistant Web chat supports also authenticated users. In those cases, you will not have an anonymous user id .
David.
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DAVID AMID
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