(C) 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 C/C++ Library Downloads
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#include <C_CkHttp.h>
#include <C_CkCert.h>
#include <C_CkBinData.h>
#include <C_CkPrivateKey.h>
#include <C_CkHttpRequest.h>
#include <C_CkHttpResponse.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    HCkHttp http;
    BOOL success;
    HCkCert cert;
    HCkBinData bdPrivKey;
    HCkPrivateKey privKey;
    HCkHttpRequest req;
    HCkHttpResponse resp;
    HCkJsonObject jResp;
    int respStatusCode;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    http = CkHttp_Create();

    // First load the certificate and private key, and set as the HTTP object's client certificate.
    cert = CkCert_Create();
    success = CkCert_LoadFromFile(cert,"<nome arquivo certificado>.crt");
    if (success == FALSE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkHttp_Dispose(http);
        CkCert_Dispose(cert);
        return;
    }

    bdPrivKey = CkBinData_Create();
    success = CkBinData_LoadFile(bdPrivKey,"<nome arquivo chave privada>.key");
    if (success == FALSE) {
        printf("Failed to load <nome\n");
        CkHttp_Dispose(http);
        CkCert_Dispose(cert);
        CkBinData_Dispose(bdPrivKey);
        return;
    }

    privKey = CkPrivateKey_Create();
    success = CkPrivateKey_LoadAnyFormat(privKey,bdPrivKey,"");
    if (success == FALSE) {
        printf("%s\n",CkPrivateKey_lastErrorText(privKey));
        CkHttp_Dispose(http);
        CkCert_Dispose(cert);
        CkBinData_Dispose(bdPrivKey);
        CkPrivateKey_Dispose(privKey);
        return;
    }

    success = CkCert_SetPrivateKey(cert,privKey);
    if (success == FALSE) {
        printf("%s\n",CkCert_lastErrorText(cert));
        CkHttp_Dispose(http);
        CkCert_Dispose(cert);
        CkBinData_Dispose(bdPrivKey);
        CkPrivateKey_Dispose(privKey);
        return;
    }

    success = CkHttp_SetSslClientCert(http,cert);
    if (success == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkCert_Dispose(cert);
        CkBinData_Dispose(bdPrivKey);
        CkPrivateKey_Dispose(privKey);
        return;
    }

    req = CkHttpRequest_Create();
    CkHttpRequest_putHttpVerb(req,"POST");
    CkHttpRequest_putPath(req,"/oauth/v2/token");
    CkHttpRequest_putContentType(req,"application/x-www-form-urlencoded");
    CkHttpRequest_AddParam(req,"grant_type","client_credentials");
    // Requested scopes in OAuth2 are typically SPACE separated.
    CkHttpRequest_AddParam(req,"scope","boleto-cobranca.read boleto-cobranca.write");
    CkHttpRequest_AddHeader(req,"accept","application/json");

    resp = CkHttp_PostUrlEncoded(http,"https://cdpj.partners.bancointer.com.br/oauth/v2/token",req);
    if (CkHttp_getLastMethodSuccess(http) == FALSE) {
        printf("%s\n",CkHttp_lastErrorText(http));
        CkHttp_Dispose(http);
        CkCert_Dispose(cert);
        CkBinData_Dispose(bdPrivKey);
        CkPrivateKey_Dispose(privKey);
        CkHttpRequest_Dispose(req);
        return;
    }

    jResp = CkJsonObject_Create();
    CkHttpResponse_GetBodyJson(resp,jResp);
    CkJsonObject_putEmitCompact(jResp,FALSE);

    printf("Response Body:\n");
    printf("%s\n",CkJsonObject_emit(jResp));

    respStatusCode = CkHttpResponse_getStatusCode(resp);
    printf("Response Status Code = %d\n",respStatusCode);
    if (respStatusCode >= 400) {
        printf("Response Header:\n");
        printf("%s\n",CkHttpResponse_header(resp));
        printf("Failed.\n");
        CkHttpResponse_Dispose(resp);
        CkHttp_Dispose(http);
        CkCert_Dispose(cert);
        CkBinData_Dispose(bdPrivKey);
        CkPrivateKey_Dispose(privKey);
        CkHttpRequest_Dispose(req);
        CkJsonObject_Dispose(jResp);
        return;
    }

    CkHttpResponse_Dispose(resp);

    success = CkJsonObject_WriteFile(jResp,"qa_data/tokens/banco_inter_client_credentials.json");
    if (success == FALSE) {
        printf("Failed to save JSON access token file.\n");
        CkHttp_Dispose(http);
        CkCert_Dispose(cert);
        CkBinData_Dispose(bdPrivKey);
        CkPrivateKey_Dispose(privKey);
        CkHttpRequest_Dispose(req);
        CkJsonObject_Dispose(jResp);
        return;
    }

    printf("Success.\n");


    CkHttp_Dispose(http);
    CkCert_Dispose(cert);
    CkBinData_Dispose(bdPrivKey);
    CkPrivateKey_Dispose(privKey);
    CkHttpRequest_Dispose(req);
    CkJsonObject_Dispose(jResp);

    }