transferToken method
Implementation
Future<Map> transferToken(
Wallet wallet, String to, String tokenContractAddress,
[BigInt? amountInWei, Wallet? gasPayer]) {
amountInWei ??= BigInt.zero;
Contract contract = Contract.fromJsonString(vthoAbi);
return transact(
wallet, contract, 'transfer', [to, amountInWei], tokenContractAddress,
gasPayer: gasPayer);
}