GET information about your account...

/api/v3/account

Example result...

{
  "account": {
          "billing_email": "billing@example.com",
          "created_at": "2021-09-12T12:34:55Z",
          "currency": "USD",
          "email": "support@example.com",
          "first_name": "John",
          "id": 123,
          "last_name": "Doe",
          "name": "My Company",
          "updated_at": "2021-09-13T10:11:12Z",
          "url": "mycompany"
  }
}

GET a new API token (this replaces your existing one)...

/api/v2/new_token
/api/v2/new_token.xml

Example result...

<?xml version="1.0" encoding="UTF-8"?>
<message>abcdef6fdas</message>