(Delphi DLL) 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 for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, HttpResponse, JsonObject, HttpRequest, BinData, PrivateKey, Cert, Http;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: HCkHttp;
success: Boolean;
cert: HCkCert;
bdPrivKey: HCkBinData;
privKey: HCkPrivateKey;
req: HCkHttpRequest;
resp: HCkHttpResponse;
jResp: HCkJsonObject;
respStatusCode: Integer;

begin
// 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) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

bdPrivKey := CkBinData_Create();
success := CkBinData_LoadFile(bdPrivKey,'<nome arquivo chave privada>.key');
if (success = False) then
  begin
    Memo1.Lines.Add('Failed to load <nome');
    Exit;
  end;

privKey := CkPrivateKey_Create();
success := CkPrivateKey_LoadAnyFormat(privKey,bdPrivKey,'');
if (success = False) then
  begin
    Memo1.Lines.Add(CkPrivateKey__lastErrorText(privKey));
    Exit;
  end;

success := CkCert_SetPrivateKey(cert,privKey);
if (success = False) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

success := CkHttp_SetSslClientCert(http,cert);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

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) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

jResp := CkJsonObject_Create();
CkHttpResponse_GetBodyJson(resp,jResp);
CkJsonObject_putEmitCompact(jResp,False);

Memo1.Lines.Add('Response Body:');
Memo1.Lines.Add(CkJsonObject__emit(jResp));

respStatusCode := CkHttpResponse_getStatusCode(resp);
Memo1.Lines.Add('Response Status Code = ' + IntToStr(respStatusCode));
if (respStatusCode >= 400) then
  begin
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(CkHttpResponse__header(resp));
    Memo1.Lines.Add('Failed.');
    CkHttpResponse_Dispose(resp);
    Exit;
  end;
CkHttpResponse_Dispose(resp);

success := CkJsonObject_WriteFile(jResp,'qa_data/tokens/banco_inter_client_credentials.json');
if (success = False) then
  begin
    Memo1.Lines.Add('Failed to save JSON access token file.');
    Exit;
  end;

Memo1.Lines.Add('Success.');

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

end;