Usage
Get PayGo Account Billable Usage (Version 1, Alpha)
client.Billing.Usage.Paygo(ctx, params) (*[]UsagePaygoResponse, error)
GET/accounts/{account_id}/paygo-usage
Get Account Usage (Version 2, Alpha, Restricted)
client.Billing.Usage.Get(ctx, params) (*[]UsageGetResponse, error)
GET/accounts/{account_id}/billable/usage