The mode of transaction fee payment using Fee Station. Currently, Fee Station supports transactions made with MPC Wallets on EVM-compatible chains, TRON, and Solana. For more details, refer to Fee Station. - ProActiveAutoFuel: Always use Fee Station to pay transaction fees. - PassiveAutoFuel: Use Fee Station only when the source address balance is insufficient to cover transaction fees. - UsePortalPreference: Use fueling strategy based on the Portal configuration. - DisableAutoFuel: Do not use Fee Station for transaction fee payment under any circumstances. If this parameter is not specified, it defaults to the behavior of UsePortalPreference. Note: TRON and Solana does not support PassiveAutoFuel due to its fee delegation mechanism.
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