(Java) Banco Inter OAuth2 Client Credentials

Generate an OAuth2 access token needed to consume the Inter APIs.

For more information, see https://developers.bancointer.com.br/reference/token-3

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();
    boolean success;

    // First load the certificate and private key, and set as the HTTP object's client certificate.
    CkCert cert = new CkCert();
    success = cert.LoadFromFile("<nome arquivo certificado>.crt");
    if (success == false) {
        System.out.println(cert.lastErrorText());
        return;
        }

    CkBinData bdPrivKey = new CkBinData();
    success = bdPrivKey.LoadFile("<nome arquivo chave privada>.key");
    if (success == false) {
        System.out.println("Failed to load <nome");
        return;
        }

    CkPrivateKey privKey = new CkPrivateKey();
    success = privKey.LoadAnyFormat(bdPrivKey,"");
    if (success == false) {
        System.out.println(privKey.lastErrorText());
        return;
        }

    success = cert.SetPrivateKey(privKey);
    if (success == false) {
        System.out.println(cert.lastErrorText());
        return;
        }

    success = http.SetSslClientCert(cert);
    if (success == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    CkHttpRequest req = new CkHttpRequest();
    req.put_HttpVerb("POST");
    req.put_Path("/oauth/v2/token");
    req.put_ContentType("application/x-www-form-urlencoded");
    req.AddParam("grant_type","client_credentials");
    // Requested scopes in OAuth2 are typically SPACE separated.
    req.AddParam("scope","boleto-cobranca.read boleto-cobranca.write");
    req.AddHeader("accept","application/json");

    CkHttpResponse resp = http.PostUrlEncoded("https://cdpj.partners.bancointer.com.br/oauth/v2/token",req);
    if (http.get_LastMethodSuccess() == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    CkJsonObject jResp = new CkJsonObject();
    resp.GetBodyJson(jResp);
    jResp.put_EmitCompact(false);

    System.out.println("Response Body:");
    System.out.println(jResp.emit());

    int respStatusCode = resp.get_StatusCode();
    System.out.println("Response Status Code = " + respStatusCode);
    if (respStatusCode >= 400) {
        System.out.println("Response Header:");
        System.out.println(resp.header());
        System.out.println("Failed.");

        return;
        }

    success = jResp.WriteFile("qa_data/tokens/banco_inter_client_credentials.json");
    if (success == false) {
        System.out.println("Failed to save JSON access token file.");
        return;
        }

    System.out.println("Success.");
  }
}