Operation

Operation = { Approve: { allowance: Tokens; expected_allowance: [] | [Tokens]; expires_at: [] | [TimeStamp]; fee: Tokens; from: string; spender: string; }; } | { Burn: { amount: Tokens; from: string; spender: [] | [string]; }; } | { Mint: { amount: Tokens; to: string; }; } | { Transfer: { amount: Tokens; fee: Tokens; from: string; spender: [] | [string]; to: string; }; }