generateIdempotencyKey

public func generateIdempotencyKey() -> String

public enum PortalIdempotencyErrorId {
  public static let requestInProgress = "IDEMPOTENT_REQUEST_IN_PROGRESS"
  public static let requestAlreadyCompleted = "IDEMPOTENT_REQUEST_ALREADY_COMPLETED"
  public static let requestPreviouslyFailed = "IDEMPOTENT_REQUEST_PREVIOUSLY_FAILED"
  public static let requestUnexpectedState = "IDEMPOTENT_REQUEST_UNEXPECTED_STATE"
  public static let keyReused = "IDEMPOTENCY_KEY_REUSED"
  public static let txMissing = "IDEMPOTENT_TX_MISSING"

  public static let all: Set<String>
}

public enum PortalIdempotencyError: LocalizedError, Equatable {
  case invalidKey(String)
  case unsupportedTarget(String)
}

import PortalSwift

do {
    let portal = try Portal(
      "YOUR_CLIENT_API_KEY",
      withRpcConfig: ["eip155:11155111": "https://sepolia.infura.io/v3/YOUR_INFURA_KEY"]
    )

    // Generate one key per transfer and store it with the pending transfer,
    // so a retry can reuse it.
    let idempotencyKey = generateIdempotencyKey()

    let response = try await portal.sendAsset(
      chainId: "eip155:11155111",
      params: SendAssetParams(
        to: "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb",
        amount: "0.01",
        token: "NATIVE",
        idempotencyKey: idempotencyKey
      )
    )

    print("Submitted — txHash: \(response.txHash)")
} catch let error as PortalMpcError where error.isIdempotencyRejection {
    print("Portal already handled this key: \(error.id ?? "unknown")")
} catch {
    print("Failed: \(error)")
}