Build a Hook

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.29;

import {AfterExecuteHook, HookParams} from "../hooks/BaseHook.sol";

contract MyRewardHook is AfterExecuteHook {
    constructor(address _gotchipus) AfterExecuteHook(_gotchipus) {}

    function _afterExecute(HookParams calldata params)
        internal
        override
        returns (bytes4)
    {
        // Your logic here
        // params.tokenId — which Gotchipus
        // params.account — the TBA address
        // params.caller  — who initiated
        // params.target  — contract being called
        // params.value   — ETH sent
        // params.selector — function selector

        return HOOK_SUCCESS;
    }
}

forge create src/hooks/MyRewardHook.sol:MyRewardHook \
  --constructor-args <GOTCHIPUS_DIAMOND_ADDRESS> \
  --rpc-url https://mainnet.base.org \
  --private-key <YOUR_KEY>

cast send <GOTCHIPUS_DIAMOND> \
  "addHook(uint256,address)" \
  <TOKEN_ID> <HOOK_ADDRESS> \
  --rpc-url https://mainnet.base.org \
  --private-key <YOUR_KEY>

function testMyHookFiresAfterExecute() public {
    // Setup: deploy diamond, mint, summon, add hook
    // Action: execute a transaction through the TBA
    // Assert: verify your hook's effects
}