buildEip155Transaction

swiftCopypublic func buildEip155Transaction(
    chainId: String,
    params: BuildTransactionParam
) async throws -> BuildEip115TransactionResponse

// Native ETH transfer
do {
    let params = BuildTransactionParam(
        to: "0x1234567890123456789012345678901234567890",
        token: "ETH",
        amount: "1000000000000000000" // 1 ETH
    )

    let response = try await portal.buildEip155Transaction(
        chainId: "eip155:1",
        params: params
    )

    print("Transaction details:")
    print("From: \(response.transaction.from)")
    print("To: \(response.transaction.to)")
    print("Value: \(response.transaction.value ?? "0")")

    print("\nMetadata:")
    print("Amount: \(response.metadata.amount)")
    print("Token Symbol: \(response.metadata.tokenSymbol ?? "ETH")")

    if let error = response.error {
        print("Warning: \(error)")
    }
} catch {
    print("Failed to build transaction: \(error)")
}

// ERC20 token transfer
do {
    // Example: Transfer 100 USDC
    let params = BuildTransactionParam(
        to: "0x1234567890123456789012345678901234567890",
        token: "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48", // USDC contract address
        amount: "100000000" // 100 USDC (6 decimals)
    )

    let response = try await portal.buildEip155Transaction(
        chainId: "eip155:1",
        params: params
    )

    // Verify the built transaction
    print("Token Transfer Details:")
    print("Contract Address: \(response.metadata.tokenAddress ?? "N/A")")
    print("Amount: \(response.metadata.amount) \(response.metadata.tokenSymbol ?? "tokens")")
    print("From: \(response.metadata.fromAddress)")
    print("To: \(response.metadata.toAddress)")
    print("Raw Amount: \(response.metadata.rawAmount)")
} catch {
    print("Failed to build token transfer: \(error)")
}

// Example with transaction validation
func buildAndValidateTransaction(
    to: String,
    token: String,
    amount: String
) async throws {
    // Build the transaction
    let params = BuildTransactionParam(
        to: to,
        token: token,
        amount: amount
    )

    let response = try await portal.buildEip155Transaction(
        chainId: "eip155:1",
        params: params
    )

    // Validate the response
    guard response.error == nil else {
        throw TransactionError.buildFailed(response.error!)
    }

    // Validate addresses
    guard response.metadata.fromAddress.starts(with: "0x"),
          response.metadata.toAddress.starts(with: "0x") else {
        throw TransactionError.invalidAddress
    }

    // Validate amount
    guard let rawAmount = Double(response.metadata.rawAmount),
          rawAmount > 0 else {
        throw TransactionError.invalidAmount
    }

    print("Transaction validated successfully")
    print("Ready to send: \(response.metadata.amount) \(response.metadata.tokenSymbol ?? "tokens")")
}