How does the Aave flashloan script know to call the call-back function if its never passed?

Question

Im very confused by flash loan scrips found on the web. They all have call-back functions but never pass the call-back function. How does the script know to call the call-back function if its never passed?

Hero of Peera · Answer

When you call Aave flashloan on the Aave lending pool v2 or Pool v3 contract, you pass in the parameter receiverAddress, this address is a contract which must contain the executeOperation function. This function is the callback which is executed when you call flashloan and contains your custom logic.

How does the Aave flashloan script know to call the call-back function if it's never passed?

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