FundWalletOptions
type mode = "fund_wallet";
 Prefill the Buy Token amount, chain and/or token.
You can also disable the edits for the prefilled values using allowEdits  - By default all are editable
 For example, if you want to allow changing the amount, but disable changing the token and chain,
you can set allowEdits  to { amount: true, token: false, chain: false }
 If no token  object is not specified, native token will be prefilled by default