# `PolarExpress.Schemas.CustomerUpdateExternalID`
[🔗](https://github.com/jeffhuen/polar_express/blob/main/lib/polar_express/schemas/customer_update_external_id.ex#L2)

CustomerUpdateExternalID

# `t`

```elixir
@type t() :: %PolarExpress.Schemas.CustomerUpdateExternalID{
  billing_address: PolarExpress.Schemas.AddressInput.t() | nil,
  email: String.t() | nil,
  locale: String.t() | nil,
  metadata:
    %{
      required(String.t()) => String.t() | integer() | float() | boolean() | nil
    }
    | nil,
  name: String.t() | nil,
  tax_id: [String.t() | PolarExpress.Schemas.TaxIDFormat.t()] | nil
}
```

* `billing_address` - Nullable.
* `email` - The email address of the customer. This must be unique within the organization. Nullable.
* `locale` - Nullable.
* `metadata` - Key-value object allowing you to store additional information.

The key must be a string with a maximum length of **40 characters**.
The value must be either:

* A string with a maximum length of **500 characters**
* An integer
* A floating-point number
* A boolean

You can store up to **50 key-value pairs**.
* `name` - Nullable.
* `tax_id` - Nullable.

# `schema_name`

---

*Consult [api-reference.md](api-reference.md) for complete listing*