We recommend reading the main readme first, to understand the requirements for using the library and how to initiate this in your apps. This guide assumes you've read that.
This describes how to resolve a bank account to get the account holder's details
Response flwResponse = new ResolveAccount()
.runTransaction(new AccountResolveRequest(
"0690000032",
"044",
Optional.empty(),
Optional.empty()
));
This describes how to fetch bvn information
Response flwResponse = new ResolveBVN().
runTransaction("123456789010");