Billing

api.deposit_address().await?;     // DepositAddress { address }
api.balance().await?;             // Balance { credits_micro, credits_usd }
api.billing_pricing().await?;     // BillingPricing
api.declare_deposit("5xK…").await?;
api.billing_history().await?;     // BillingHistory { deposits, charges }

pub struct BillingPricing {
    pub unit: String,                          // "microUSD"
    pub micro_per_usd: u64,                    // 1_000_000
    pub ops: HashMap<String, u64>,             // microUSD per op
    pub ops_usd: HashMap<String, String>,      // same prices as USD strings
    pub accepted_coin_types: Vec<String>,
    pub min_deposit_micro: u64,
    pub min_deposit_usd: String,
    pub coin_prices_usd: HashMap<String, String>,
    pub price_feed: PriceFeed,
}

pub struct PriceFeed {
    pub source: String,           // "feed" | "fallback" | "mixed"
    pub loaded_at: u64,
    pub last_feed_success_at: u64,
    pub stale: bool,
}

let addr = api.deposit_address().await?;
// send accepted coin to addr.address from any Sui wallet, then:
api.declare_deposit(&tx_digest).await?;
let bal = api.balance().await?;
println!("credits: ${}", bal.credits_usd);