Chilkat Examples

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Delphi DLL Web API Examples

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(Delphi DLL) PayPal - Find Captures

Finds captures for previous authorizations. (A capture is when the funds from an authorization are captured. There can be more than one capture, where the sum adds to the full authorization amount or an amount lower than the authorized amount.)

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;
sbJsonResponse: HCkStringBuilder;
json: HCkJsonObject;
sbTemp: HCkStringBuilder;
numPayments: Integer;
i: Integer;
j: Integer;
numTransactions: Integer;
numRelatedResources: Integer;
k: Integer;
jsonCapture: HCkJsonObject;

begin
// Note: Requires Chilkat v9.5.0.65 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..
// ----------------------------------------------------------------------------------------------

// Clear the REST object of any headers or query params from previous requests.
CkRest_ClearAllHeaders(rest);
CkRest_ClearAllQueryParams(rest);

CkRest_AddHeader(rest,'Authorization',CkStringBuilder__getAsString(sbAuth));

// To find captured payments, we list payments and look for those
// containing a "capture" resource.
CkRest_AddQueryParam(rest,'count','100');
CkRest_AddQueryParam(rest,'start_index','0');
CkRest_AddQueryParam(rest,'sort_by','update_time');
CkRest_AddQueryParam(rest,'sort_order','asc');

// Send the GET request and get the JSON response.
sbJsonResponse := CkStringBuilder_Create();
success := CkRest_FullRequestNoBodySb(rest,'GET','/v1/payments/payment',sbJsonResponse);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

json := CkJsonObject_Create();
CkJsonObject_putEmitCompact(json,False);
CkJsonObject_LoadSb(json,sbJsonResponse);

// (optional) Save the entire JSON response to a file to examine if desired..
sbTemp := CkStringBuilder_Create();
CkJsonObject_EmitSb(json,sbTemp);
CkStringBuilder_WriteFile(sbTemp,'qa_output/paypal_payments.json','utf-8',False);

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

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

// We are looking for "capture" resources .
// As shown below, we are looking in the "transactions" for "related_resources"
// containing "capture" JSON objects. 

// 	{ 
// 	  "payments": [
// 	    { 
// 	      "id": "PAY-2CY489250W145633HLA3DK3Y",
// 	      "create_time": "2016-11-24T00:33:51Z",
// 	      "update_time": "2016-11-24T00:40:54Z",
// 	      "state": "approved",
// 	      "intent": "authorize",
// 	      "payer": { 
// 	        "payment_method": "credit_card",
// 	        "funding_instruments": [
// 	          { 
// 	            ...
// 	          }
// 	        ]
// 	      },
// 	      "transactions": [
// 	        { 
// 	          "amount": { 
// 	            ...
// 	          },
// 	          "description": "This is the payment transaction description.",
// 	          "related_resources": [
// 	            { 
// 	              "authorization": { 
// 	                ...
// 	              }
// 	            },
// 	            { 
// 	              "capture": { 
// 	                "id": "1LY5310469661362J",
// 	                "create_time": "2016-11-24T00:40:50Z",
// 	                "update_time": "2016-11-24T00:40:54Z",
// 	                "amount": { 
// 	                  "total": "4.54",
// 	                  "currency": "USD"
// 	                },
// 	                "state": "completed",
// 	                "parent_payment": "PAY-2CY489250W145633HLA3DK3Y",
// 	                "transaction_fee": { 
// 	                  "value": "0.43",
// 	                  "currency": "USD"
// 	                },
// 			...
// 

// Iterate over the payments and show each capture
numPayments := CkJsonObject_SizeOfArray(json,'payments');
i := 0;
while i < numPayments do
  begin
    CkJsonObject_putI(json,i);
    j := 0;
    numTransactions := CkJsonObject_SizeOfArray(json,'payments[i].transactions');
    while j < numTransactions do
      begin
        CkJsonObject_putJ(json,j);
        numRelatedResources := CkJsonObject_SizeOfArray(json,'payments[i].transactions[j].related_resources');
        k := 0;
        while k < numRelatedResources do
          begin
            CkJsonObject_putK(json,k);
            if (CkJsonObject_HasMember(json,'payments[i].transactions[j].related_resources[k].capture') = True) then
              begin
                jsonCapture := CkJsonObject_ObjectOf(json,'payments[i].transactions[j].related_resources[k].capture');
                Memo1.Lines.Add('capture id: ' + CkJsonObject__stringOf(jsonCapture,'id'));
                Memo1.Lines.Add('state: ' + CkJsonObject__stringOf(jsonCapture,'state'));
                Memo1.Lines.Add('total: ' + CkJsonObject__stringOf(jsonCapture,'amount.total'));
                Memo1.Lines.Add('----');
                CkJsonObject_Dispose(jsonCapture);
              end;
            k := k + 1;
          end;

        j := j + 1;
      end;

    i := i + 1;
  end;

Memo1.Lines.Add('success');

CkJsonObject_Dispose(jsonToken);
CkStringBuilder_Dispose(sbAuth);
CkRest_Dispose(rest);
CkStringBuilder_Dispose(sbJsonResponse);
CkJsonObject_Dispose(json);
CkStringBuilder_Dispose(sbTemp);

end;

 

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