PaypalSTCClient.access_key = "access_key";
PaypalSTCClient.secret_key = "secret_key";
PaypalSTCClient.merchant_id = "merchant_id";
PaypalSTCClient.test = true;

PaypalRiskRequest paypalRiskRequest = new PaypalRiskRequest();
paypalRiskRequest.setTrackingId("tracking_id");

PaypalAccountDetails paypalAccountDetails = new PaypalAccountDetails();
paypalAccountDetails.setFirstName("Name");

...

PaypalAccount senderAccount = new PaypalAccount();
senderAccount.setPartnerAccount(paypalAccountDetails);
paypalRiskRequest.setSenderAccount(senderAccount);

PaypalSTCClient.sendInfomation("tracking_id", paypalRiskRequest);