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I am building a middleware contract to interact with 0x protocol. so for swapping tokens should I approve(erc20 function) directly 0x address for transferring asset or the address from the function 'getTransformerDeployer'. In other words should i transfer assets from user address to 0x contract address or the address from 'getTransformerDeployer' or 'getTransformWallet'

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You approve the 0x exchange proxy address, 0xdef1c0ded9bec7f1a1670819833240f027b25eff. This is returned in 0xAPI responses as allowanceTarget.

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