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You can find the source code to this tutorial in Patrick's GitHub => https://github.com/PatrickAlphaC/fund-me-fcc
If we wanted to inspect this AggregatorV3Interface aggregator contract, we could go to the following link and check it out => https://github.com/smartcontractkit/chainlink/blob/develop/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol As you can see, it has some functions like version, getRoundData, latestRoundData and so on. The thing is, we can import this aggrgator contract in our smart contract and actually use those functions in our smart contract.