curl --request GET \
  --url https://api.rezora.io/api/v1/contacts/groups/{id}/ \
  --header 'Authorization: Bearer <token>'

{
  "address": "<string>",
  "contact_group_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "custom_fields": {},
  "email": "jsmith@example.com",
  "first_name": "<string>",
  "last_name": "<string>",
  "phone_number": "<string>",
  "phone_numbers": [
    {}
  ],
  "csv_headers": [
    "<string>"
  ],
  "data": "<unknown>"
}