Integration Patterns

-- Implement token standard interfaces
template MyToken
  with
    issuer : Party
    holder : Party
    amount : Decimal
  where
    signatory issuer
    observer holder

    -- Implement standard holding interface
    interface instance HoldingInterface for MyToken where
      view = HoldingView with
        custodian = issuer
        owner = holder
        amount = amount

    -- Standard transfer choice
    choice Transfer : ContractId MyToken
      with
        newHolder : Party
      controller holder
      do
        create this with holder = newHolder

async function submitWithRetry<T>(command: Command, maxRetries = 3): Promise<T> {
  for (let attempt = 0; attempt < maxRetries; attempt++) {
    try {
      return await ledgerApi.submit(command);
    } catch (error) {
      if (isRetryable(error) && attempt < maxRetries - 1) {
        await sleep(Math.pow(2, attempt) * 1000);
        continue;
      }
      throw error;
    }
  }
  throw new Error("Max retries exceeded");
}