(Delphi ActiveX) QuickBooks - Query a Customer

Demonstrates how to query QuickBooks customers.

A sample JSON response body is available at Sample Quickbooks Customer Query JSON Response

For more information, see https://developer.intuit.com/app/developer/qbo/docs/api/accounting/all-entities/customer#query-a-customer

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

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
jsonToken: TChilkatJsonObject;
success: Integer;
rest: TChilkatRest;
bAutoReconnect: Integer;
sbAuth: TChilkatStringBuilder;
query: WideString;
responseBody: WideString;
json: TChilkatJsonObject;
numRecords: Integer;
i: Integer;

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

// Get our previously obtained OAuth2 access token, which should contain JSON like this:
// {
//   "expires_in": 3600,
//   "x_refresh_token_expires_in": 8726400,
//   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
//   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
//   "token_type": "bearer"
// }

jsonToken := TChilkatJsonObject.Create(Self);
success := jsonToken.LoadFile('qa_data/tokens/qb-access-token.json');

rest := TChilkatRest.Create(Self);

// Connect using TLS.
// A single REST object, once connected, can be used for many Quickbooks REST API calls.
// The auto-reconnect indicates that if the already-established HTTPS connection is closed,
// then it will be automatically re-established as needed.
bAutoReconnect := 1;
success := rest.Connect('sandbox-quickbooks.api.intuit.com',443,1,bAutoReconnect);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

sbAuth := TChilkatStringBuilder.Create(Self);
sbAuth.Append('Bearer ');
sbAuth.Append(jsonToken.StringOf('access_token'));
rest.Authorization := sbAuth.GetAsString();

rest.AddHeader('Accept','application/json');
rest.AllowHeaderFolding := 0;

query := 'select * from Customer';
rest.AddQueryParam('query',query);
rest.AddQueryParam('minorversion','45');

// The company ID is 123146096291789
responseBody := rest.FullRequestNoBody('GET','/v3/company/123146096291789/query');
if (rest.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// We should expect a 200 response if successful.
if (rest.ResponseStatusCode <> 200) then
  begin
    Memo1.Lines.Add('Request Header: ');
    Memo1.Lines.Add(rest.LastRequestHeader);
    Memo1.Lines.Add('----');
    Memo1.Lines.Add('Response StatusCode = ' + IntToStr(rest.ResponseStatusCode));
    Memo1.Lines.Add('Response StatusLine: ' + rest.ResponseStatusText);
    Memo1.Lines.Add('Response Header:');
    Memo1.Lines.Add(rest.ResponseHeader);
    Memo1.Lines.Add(responseBody);
    Exit;
  end;

// Load the JSON response into a JSON object for parsing.
// A sample JSON response is shown below.
json := TChilkatJsonObject.Create(Self);
json.EmitCompact := 0;
json.Load(responseBody);

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

// Iterate over each customer returned.
numRecords := json.SizeOfArray('QueryResponse.Customer');
i := 0;
while i < numRecords do
  begin

    json.I := i;
    Memo1.Lines.Add('Name: ' + json.StringOf('QueryResponse.Customer[i].FullyQualifiedName'));
    Memo1.Lines.Add('Id: ' + json.StringOf('QueryResponse.Customer[i].Id'));
    Memo1.Lines.Add('City: ' + json.StringOf('QueryResponse.Customer[i].BillAddr.City'));
    Memo1.Lines.Add('----');
    i := i + 1;
  end;

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