Retrieves a specific customer balance transaction that updated the customer's [balances](https://stripe.com/docs/billing/customer/balance).

Returns a list of transactions that updated the customer's [balances](https://stripe.com/docs/billing/customer/balance).

Creates an immutable transaction that updates the customer's credit [balance](https://stripe.com/docs/billing/customer/balance).

Most credit balance transaction fields are immutable, but you may update its description and metadata.

Client is used to invoke /customers/{customer}/balance_transactions APIs.

Iter is an iterator for customer balance transactions.