in src/main/scala/com/gu/invoicing/refund/Impl.scala [17:22]
def getSubscription(name: String): Subscription =
get[Subscription](s"$zuoraApiHost/v1/subscriptions/$name")
def getAccountBalance(accountId: String): BigDecimal = {
get[Account](s"$zuoraApiHost/v1/accounts/$accountId").metrics.balance
}