Adds the specified tags to contacts selected by contact IDs, emails, phone numbers or a segment.
At least one of contactIDs, emails, phones or segmentID is required.
Selectors can be combined and are applied additively — the union of all matched contacts is tagged:
every contact in contactIDs, every contact matched by an address in emails, every contact matched
by a number in phones and every member of segmentID. A contact matched by more than one selector
is tagged once. Emails and phones with no matching contact are silently ignored.
Tagging is performed asynchronously, so the tags may not be visible immediately.

Scopes:
contacts.write

Rate Limiting:
This endpoint is rate limited to 60 requests per minute.