# Migration to smart contract v2

**Migration Steps**

1. **Enable Version 2 in Quote Requests**
   * In your **quote** endpoint, include the parameter `version=v2`.
   * This ensures that our system utilizes the latest version of the smart contracts.
2. **Update the Unizen Contract Addresses Package**
   * Upgrade to the latest [**Unizen contract addresses package**](https://www.npmjs.com/package/@unizen-io/unizen-contract-addresses) to retrieve the new `unizenRouter` address.
   * This is the **only address** needed for approvals—no more version-specific handling.
3. **Use the Unizen Router for Transaction Execution**
   * When executing a transaction from the user's wallet (for non-gasless trades), use the **Unizen Router address**.
   * The **swap** endpoint will continue to return the correct contract details, including the necessary approval information (if applicable, unless it’s a **Permit2** trade).

#### **That's It!**

With just these simple steps, your integration will be fully compatible with **Version 2** of Unizen’s API. By upgrading, you ensure improved efficiency, reduced costs, and enhanced functionality.


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