> For the complete documentation index, see [llms.txt](https://docs.uncx.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.uncx.network/guides/for-developers/liquidity-lockers/lockers-v3/technical-reference/nft-migrator-v3.md).
# NFT Migrator V3
## Functions Write
### Migrate
```
function migrate ( uint256 _lockId, INonfungiblePositionManager _nftPositionManager, uint256 _tokenId) external returns (bool)
```
Enables migration of liqudity from Uniswap Locker V2 into Locker V3.
Parameters:
| Name | Type | Description |
| -------------------- | --------------------------- | -------------------------------------------------------------------------------------- |
| \_lockId | uint256 | ID of the lock to be migrated from the older contract. |
| \_nftPositionManager | INonfungiblePositionManager | The position manager for the NFT. |
| \_tokenId | uint256 | ID of the NFT token to be transferred and then approved for the new reserves contract. |
Return Values:
| Type | Description |
| ---- | -------------------------------------------------------------------- |
| bool | Returns `true` once the migration process is successfully completed. |
## Functions Wiew
### OnERC721Received
Parameters:
| Name | Type | Description |
| -------- | ------- | ------------------------------------------------------------------------------------------- |
| operator | address | Address initiating the transfer or creation. This could be an external or contract address. |
| from | address | Address from which the token was sent. |
| tokenId | uint256 | Unique identifier for the token being transferred. |
| data | bytes | Additional data accompanying the transfer or minting call. |
Return Values:
| Type | Description |
| ------ | ------------------------------------------------------------------------------------------- |
| bytes4 | Function selector for the `onERC721Received` function, confirming successful token receipt. |
---
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