When a user subscribes to an additional list or service, you should update the tag without overwriting previous selections. To do this, use the specific operations available in the /setTags API:
- Append: Use the
appendoperation to add new values to a List tag. - Remove: Use the
removeoperation to delete specific values from a List tag.
This approach allows you to modify preferences without reading and re-sending the entire tag value.
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