I've been driving myself crazy for days trying to figure it out.
When I search "tags" in the docs, the only results seem to relate to creating and editing the tag records themselves rather than any association to a contact's record.
I see this test class linked from this issue but don't understand since there isn't actual documentation or a simple example of how to use the API to add a tag to a contact.
I'd appreciate any help. Thanks.
'tags' => ['tag1', 'tag2']
P.S. That test class code seems to be for creating a new contact with certain tags, when instead what I want to do is associate an existing tag with an existing contact.