(Delphi DLL) PayPal - Refund Captured Payment

Refunds a captured payment, by ID. Include an amount object in the JSON request body.

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

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, StringBuilder, Rest, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
jsonToken: HCkJsonObject;
sbAuth: HCkStringBuilder;
rest: HCkRest;
bAutoReconnect: Boolean;
success: Boolean;
json: HCkJsonObject;
sbPath: HCkStringBuilder;
numReplaced: Integer;
sbJsonRequest: HCkStringBuilder;
sbJsonResponse: HCkStringBuilder;

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 := CkJsonObject_Create();
CkJsonObject_LoadFile(jsonToken,'qa_data/tokens/paypal.json');

// Build the Authorization request header field value.
sbAuth := CkStringBuilder_Create();
// token_type should be "Bearer"
CkStringBuilder_Append(sbAuth,CkJsonObject__stringOf(jsonToken,'token_type'));
CkStringBuilder_Append(sbAuth,' ');
CkStringBuilder_Append(sbAuth,CkJsonObject__stringOf(jsonToken,'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 := CkRest_Create();
bAutoReconnect := True;
success := CkRest_Connect(rest,'api.sandbox.paypal.com',443,True,bAutoReconnect);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    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..
// ----------------------------------------------------------------------------------------------

// To refund a particular amount, build JSON such as this:
json := CkJsonObject_Create();
CkJsonObject_putEmitCompact(json,False);
CkJsonObject_UpdateString(json,'amount.total','4.54');
CkJsonObject_UpdateString(json,'amount.currency','USD');
CkJsonObject_UpdateString(json,'description','Athletic socks');
CkJsonObject_UpdateString(json,'reason','Refunding because color was incorrect');
Memo1.Lines.Add(CkJsonObject__emit(json));

// The JSON:

// 	{ 
// 	  "amount": { 
// 	    "total": "4.54",
// 	    "currency": "USD"
// 	  },
// 	  "description": "Athletic socks",
// 	  "reason": "Refunding because color was incorrect"
// 	}
// 
CkRest_AddHeader(rest,'Authorization',CkStringBuilder__getAsString(sbAuth));
CkRest_AddHeader(rest,'Content-Type','application/json');

// The capture ID is added to the path.
// To list your captures: Find Captures. 
sbPath := CkStringBuilder_Create();
CkStringBuilder_Append(sbPath,'/v1/payments/capture/capture_id/refund');
numReplaced := CkStringBuilder_Replace(sbPath,'capture_id','1LY5310469661362J');

// Send the POST request containign the JSON in the request body, and get the JSON response.
sbJsonRequest := CkStringBuilder_Create();
CkJsonObject_putEmitCompact(json,True);
CkJsonObject_EmitSb(json,sbJsonRequest);
sbJsonResponse := CkStringBuilder_Create();

success := CkRest_FullRequestSb(rest,'POST',CkStringBuilder__getAsString(sbPath),sbJsonRequest,sbJsonResponse);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

CkJsonObject_putEmitCompact(json,False);
CkJsonObject_LoadSb(json,sbJsonResponse);

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

// Did we get a 201 success response?
if (CkRest_getResponseStatusCode(rest) <> 201) then
  begin
    Memo1.Lines.Add(CkJsonObject__emit(json));
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

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

// A successful JSON response:
// The "id" is the refund_id.

// 	{ 
// 	  "id": "77B77607RR7243500",
// 	  "create_time": "2016-11-27T01:38:25Z",
// 	  "update_time": "2016-11-27T01:38:25Z",
// 	  "state": "completed",
// 	  "amount": { 
// 	    "total": "4.54",
// 	    "currency": "USD"
// 	  },
// 	  "capture_id": "1LY5310469661362J",
// 	  "parent_payment": "PAY-2CY489250W145633HLA3DK3Y",
// 	  "links": [
// 	    { 
// 	      "href": "https://api.sandbox.paypal.com/v1/payments/refund/77B77607RR7243500",
// 	      "rel": "self",
// 	      "method": "GET"
// 	    },
// 	    { 
// 	      "href": "https://api.sandbox.paypal.com/v1/payments/payment/PAY-2CY489250W145633HLA3DK3Y",
// 	      "rel": "parent_payment",
// 	      "method": "GET"
// 	    },
// 	    { 
// 	      "href": "https://api.sandbox.paypal.com/v1/payments/capture/1LY5310469661362J",
// 	      "rel": "capture",
// 	      "method": "GET"
// 	    }
// 	  ]
// 	}

CkJsonObject_Dispose(jsonToken);
CkStringBuilder_Dispose(sbAuth);
CkRest_Dispose(rest);
CkJsonObject_Dispose(json);
CkStringBuilder_Dispose(sbPath);
CkStringBuilder_Dispose(sbJsonRequest);
CkStringBuilder_Dispose(sbJsonResponse);

end;