# `LatticeStripe.Billing.Meter.CustomerMapping`
[🔗](https://github.com/szTheory/lattice_stripe/blob/v2.2.2/lib/lattice_stripe/billing/meter/customer_mapping.ex#L1)

How a `LatticeStripe.Billing.MeterEvent` payload is mapped to a Stripe
customer. Currently Stripe exposes `"by_id"` with `event_payload_key`
naming the field inside `payload` that carries a `cus_*` customer ID.
`:extra` captures any future mapping types Stripe adds.

# `t`

```elixir
@type t() :: %LatticeStripe.Billing.Meter.CustomerMapping{
  event_payload_key: String.t() | nil,
  extra: map(),
  type: String.t() | nil
}
```

# `from_map`

```elixir
@spec from_map(map() | nil) :: t() | nil
```

---

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