amountFeeAsset property
read / write
(optional) The asset in which fees are calculated in. Must be present if the deposit/withdraw was made using non-equivalent assets. The value must be in SEP-38 Asset Identification Format. https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0038.md#asset-identification-format See also the Asset Exchanges section for more information. https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0024.md#asset-exchanges
Implementation
String? amountFeeAsset;