# Conditional Shipment

### Conditional On-Chain Package Shipment

As an example, we can create a wrapper contract that will only allow users to ship a package if more than 1,000,000 USDC is included.

```solidity
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.15;

import "./PostOffice.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

contract MillionDollarShipmentService {
    using SafeERC20 for IERC20;

    PostOffice public postOffice;
    IERC20 public usdcToken;

    uint8 public constant USDC_DECIMALS = 6;
    uint256 public constant MIN_PACKAGE_VALUE = 1_000_000 * 10 ** USDC_DECIMALS;

    constructor(address _postOfficeAddress, address _usdcTokenAddress) {
        postOffice = PostOffice(_postOfficeAddress);
        usdcToken = IERC20(_usdcTokenAddress);
    }

    function createMillionDollarPackage(
        CapsuleData.CapsuleContent calldata packageContent_,
        PostOffice.SecurityInfo calldata securityInfo_,
        address receiver_,
        uint256 usdcAmount_
    ) external returns (uint256) {
        require(usdcAmount_ >= MIN_PACKAGE_VALUE, "Package value is below 1 million USDC");

        usdcToken.safeTransferFrom(msg.sender, address(this), usdcAmount_);

        return postOffice.shipPackage(packageContent_, securityInfo_, receiver_);
    }

    function pickup(
        uint256 packageId_,
        string calldata rawPassword_,
        string calldata salt_,
        bool shouldRedeem_
    ) external {
        postOffice.pickup(packageId_, rawPassword_, salt_, shouldRedeem_);
    }
}
```

`MillionDollarShipmentService` allows users to create a unique shipment by providing more than 1,000,000 USDC tokens. The `createMillionDollarPackage` method creates the package by transferring the USDC tokens from the sender to the contract if the million dollar criteria is met, and then invokes the `shipPackage` method from the `PostOffice` contract to initiate the shipment process.


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