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Creating configuration

The basic kit initialization consists of creating a corresponding object by passing it a minimal set of necessary arguments. Pick a TON network to operate on, a wallet manifest, and feature configurations. Here is an example of a minimal configuration: 
import TONWalletKit

// URL of the wallet's implementation of the HTTP bridge:
// https://github.com/ton-connect/docs/blob/main/bridge.md#http-bridge
//
// Can be different, e.g., https://bridge.tonapi.io/bridge
let bridgeURL = "https://connect.ton.org/bridge"

let features: [TONWalletKitConfiguration.Feature] = [
    // Wallet can send transactions.
    TONWalletKitConfiguration.SendTransactionFeature(
        // Max number of messages that can be sent in a single transaction.
        // Depends on the TON wallet used, because different kinds can handle
        // different number of messages.
        maxMessages: 1,

        // Are messages sending extra-currencies supported?
        extraCurrencySupported: false
    ),
    TONWalletKitConfiguration.SignDataFeature(types: [
        // Types of data to sign.
        .text, .binary, .cell
    ]),
]

let configuration = TONWalletKitConfiguration(
    network: .mainnet, /* or .testnet */
    walletManifest: TONWalletKitConfiguration.Manifest(
        name: "Name of your wallet service",
        appName: "your_wallet_service_id", /* e.g. best_ton_wallet_service */
        imageUrl: "https://<YOUR_WALLET_SERVICE_URL>/image.png",
        aboutUrl: "https://<YOUR_WALLET_SERVICE_URL>/about",
        universalLink: "https://<YOUR_WALLET_SERVICE_URL>/universal-link",
        bridgeUrl: bridgeURL
    ),
    features: features
)

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Creating WalletKit instance

Once you have a configuration, create an instance of the kit: 
import TONWalletKit

// Instructs how to store intermediate events and other data from the WalletKit.
let storage: TONWalletKitStorageType = .memory // .keychain or .custom(/* custom storage */)

// Instance
let walletKit = try await TONWalletKit.initialize(
      configuration: configuration,
      storage: storage
)

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Creating custom storage

One can implement a custom storage and provide it during initialization: 
import TONWalletKit

class YourCustomStorage: TONWalletKitStorage {
    func save(key: String, value: String) throws { ... }
    func get(key: String) throws -> String? { ... }
    func remove(key: String) throws { ... }
    func clear() throws { ... }
}

let walletKit = try await TONWalletKit.initialize(
      configuration: configuration,
      storage: .custom(YourCustomStorage())
)