SpendPermissionInput

type SpendPermissionInput = Omit<SpendPermission, "token" | "period" | "start" | "end" | "salt" | "extraData"> & {
  token:   | "eth"
     | "usdc"
     | EvmAddress;
  period?: number;
  periodInDays?: number;
  start?: Date;
  end?: Date;
  salt?: bigint;
  extraData?: Hex;
};

token: 
  | "eth"
  | "usdc"
  | EvmAddress;

optional period: number;

optional periodInDays: number;

optional start: Date;

optional end: Date;

optional salt: bigint;

optional extraData: Hex;