(Delphi ActiveX) PayPal - Void an Authorization

Voids a previously authorized payment.

Note: A fully captured authorization cannot be voided.

Note: This example requires Chilkat v9.5.0.65 or greater.

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;
sbAuth: TChilkatStringBuilder;
rest: TChilkatRest;
bAutoReconnect: Integer;
success: Integer;
json: TChilkatJsonObject;
sbPath: TChilkatStringBuilder;
numReplaced: Integer;
sbJsonRequest: TChilkatStringBuilder;
sbJsonResponse: TChilkatStringBuilder;

begin
// Note: Requires Chilkat v9.5.0.64 or greater.

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

// Load our previously obtained access token. (see PayPal OAuth2 Access Token)
jsonToken := TChilkatJsonObject.Create(Self);
jsonToken.LoadFile('qa_data/tokens/paypal.json');

// Build the Authorization request header field value.
sbAuth := TChilkatStringBuilder.Create(Self);
// token_type should be "Bearer"
sbAuth.Append(jsonToken.StringOf('token_type'));
sbAuth.Append(' ');
sbAuth.Append(jsonToken.StringOf('access_token'));

// Make the initial connection.
// A single REST object, once connected, can be used for many PayPal 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.
rest := TChilkatRest.Create(Self);
bAutoReconnect := 1;
success := rest.Connect('api.sandbox.paypal.com',443,1,bAutoReconnect);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

// ----------------------------------------------------------------------------------------------
// The code above this comment could be placed inside a function/subroutine within the application
// because the connection does not need to be made for every request.  Once the connection is made
// the app may send many requests..
// ----------------------------------------------------------------------------------------------

json := TChilkatJsonObject.Create(Self);
json.EmitCompact := 0;

// This is the OAuth2 Authorization header, not to be confused with a PayPal credit card authorization...
rest.AddHeader('Authorization',sbAuth.GetAsString());
rest.AddHeader('Content-Type','application/json');

// The authorization ID is added to the path.
// The authorization ID is obtained from payment records as shown here: Find Authorizations
sbPath := TChilkatStringBuilder.Create(Self);
sbPath.Append('/v1/payments/authorization/authorization_id/void');
numReplaced := sbPath.Replace('authorization_id','0SU72290A8399291G');

// Send the POST request containing an empty JSON body, and get the JSON response.
sbJsonRequest := TChilkatStringBuilder.Create(Self);
sbJsonRequest.Append('{}');

sbJsonResponse := TChilkatStringBuilder.Create(Self);

success := rest.FullRequestSb('POST',sbPath.GetAsString(),sbJsonRequest.ControlInterface,sbJsonResponse.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

json.EmitCompact := 0;
json.LoadSb(sbJsonResponse.ControlInterface);

Memo1.Lines.Add('Response Status Code = ' + IntToStr(rest.ResponseStatusCode));

// Did we get a 200 success response?
if (rest.ResponseStatusCode <> 200) then
  begin
    Memo1.Lines.Add(json.Emit());
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

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

// A successful JSON response:

// 	{ 
// 	  "id": "0SU72290A8399291G",
// 	  "create_time": "2016-11-26T17:31:05Z",
// 	  "update_time": "2016-11-26T17:31:10Z",
// 	  "amount": { 
// 	    "total": "6.70",
// 	    "currency": "USD",
// 	    "details": { 
// 	      "subtotal": "6.70"
// 	    }
// 	  },
// 	  "state": "voided",
// 	  "parent_payment": "PAY-62106714J93631829LA44NWI",
// 	  "links": [
// 	    { 
// 	      "href": "https://api.sandbox.paypal.com/v1/payments/authorization/0SU72290A8399291G",
// 	      "rel": "self",
// 	      "method": "GET"
// 	    },
// 	    { 
// 	      "href": "https://api.sandbox.paypal.com/v1/payments/payment/PAY-62106714J93631829LA44NWI",
// 	      "rel": "parent_payment",
// 	      "method": "GET"
// 	    }
// 	  ]
// 	}
end;