Get your DocuSign account's base URI and configure api client

GetBaseUri.java

AuthenticationApi authApi = new AuthenticationApi(apiClient);
LoginInformation loginInfo = authApi.login();

// note that the user might belong to multiple accounts, here we simply get first
String accountId = loginInfo.getLoginAccounts().get(0).getAccountId(); 
String baseUrl = loginInfo.getLoginAccounts().get(0).getBaseUrl();

// important: below code is required for production as the account sub-domains vary in the
// live system. We strip the base URI down to the form https://{env}.docusign.net/restapi
// then re-configure the api client with the new base path
String[] accountDomain = baseUrl.split("/v2");
apiClient.setBasePath(accountDomain[0]);
Configuration.setDefaultApiClient(apiClient);