# CallbackValidation

Provides validation for callbacks from Bonsaiswap V3 Pools

### Functions[​](https://docs.uniswap.org/contracts/v3/reference/periphery/libraries/CallbackValidation#functions) <a href="#functions" id="functions"></a>

#### verifyCallback[​](https://docs.uniswap.org/contracts/v3/reference/periphery/libraries/CallbackValidation#verifycallback) <a href="#verifycallback" id="verifycallback"></a>

```solidity
  function verifyCallback(
    address factory,
    address tokenA,
    address tokenB,
    uint24 fee
  ) internal returns (contract IBonsaiswapV3Pool pool)
```

Returns the address of a valid Bonsaiswap V3 Pool

**Parameters:**[**​**](https://docs.uniswap.org/contracts/v3/reference/periphery/libraries/CallbackValidation#parameters)

| Name      | Type    | Description                                                                       |
| --------- | ------- | --------------------------------------------------------------------------------- |
| `factory` | address | The contract address of the Bonsaiswap V3 factory                                 |
| `tokenA`  | address | The contract address of either token0 or token1                                   |
| `tokenB`  | address | The contract address of the other token                                           |
| `fee`     | uint24  | The fee collected upon every swap in the pool, denominated in hundredths of a bip |

**Return Values:**[**​**](https://docs.uniswap.org/contracts/v3/reference/periphery/libraries/CallbackValidation#return-values)

| Name   | Type              | Description                  |
| ------ | ----------------- | ---------------------------- |
| `pool` | IBonsaiswapV3Pool | The V3 pool contract address |

#### verifyCallback[​](https://docs.uniswap.org/contracts/v3/reference/periphery/libraries/CallbackValidation#verifycallback-1) <a href="#verifycallback-1" id="verifycallback-1"></a>

```solidity
  function verifyCallback(
    address factory,
    struct PoolAddress.PoolKey poolKey
  ) internal returns (contract IBonsaiswapV3Pool pool)
```

Returns the address of a valid Bonsaiswap V3 Pool

**Parameters:**[**​**](https://docs.uniswap.org/contracts/v3/reference/periphery/libraries/CallbackValidation#parameters-1)

| Name      | Type                       | Description                                       |
| --------- | -------------------------- | ------------------------------------------------- |
| `factory` | address                    | The contract address of the Bonsaiswap V3 factory |
| `poolKey` | struct PoolAddress.PoolKey | The identifying key of the V3 pool                |

**Return Values:**[**​**](https://docs.uniswap.org/contracts/v3/reference/periphery/libraries/CallbackValidation#return-values-1)

| Name   | Type              | Description                  |
| ------ | ----------------- | ---------------------------- |
| `pool` | IBonsaiswapV3Pool | The V3 pool contract address |


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://bonsaiswap.gitbook.io/bonsaiswap-docs/developers/technical-reference/periphery/libraries/callbackvalidation.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.