Soft-delete a contact identified by email or phone_number.
Provide exactly one identifier.
Deleted contacts can be restored if a new contact is created with the same email or phone number via the Create a contact endpoint.
Required scope: contacts_write
OAuth 2.0 client credentials flow. Exchange your client ID and client
secret for an access token at the token URL, then include it as
Authorization: Bearer <token>. See the Authentication page for details.
Contact deleted successfully.