It is possible to deploy your own FxERC20RootTunnel and FxERC20RootTunnelChild contracts but it is not recommended to do so, as the polygon team has already done this for you. Moreover, the team has provided maticjs-fxportal sdk which can be used to easily set up a fxPortalClient, where all the configurations are handled internally and you don’t need to do any configuration yourself just called the required functionality for your deposit or withdrawal process.
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