(Delphi ActiveX) PayPal - Create a PayPal Payment

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Creates a payment to be paid from a PayPal account (as opposed to being funded by a credit card).

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;
sbJsonRequest: TChilkatStringBuilder;
sbJsonResponse: TChilkatStringBuilder;

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 := 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..
// ----------------------------------------------------------------------------------------------

// Build the JSON containing the transaction information.
json := TChilkatJsonObject.Create(Self);
json.EmitCompact := 0;
json.UpdateString('intent','sale');
json.UpdateString('redirect_urls.return_url','http://www.example.com/return_url');
json.UpdateString('redirect_urls.cancel_url','http://www.example.com/cancel_url');
json.UpdateString('payer.payment_method','paypal');
json.UpdateString('transactions[0].amount.total','7.47');
json.UpdateString('transactions[0].amount.currency','USD');
json.UpdateString('transactions[0].description','This is the payment transaction description.');

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

// The JSON created by the above code is this:

// 	{ 
// 	  "intent": "sale",
// 	  "redirect_urls": { 
// 	    "return_url": "http://www.example.com/return_url",
// 	    "cancel_url": "http://www.example.com/cancel_url"
// 	  },
// 	  "payer": { 
// 	    "payment_method": "paypal"
// 	  },
// 	  "transactions": [
// 	    { 
// 	      "amount": { 
// 	        "total": "7.47",
// 	        "currency": "USD"
// 	      },
// 	      "description": "This is the payment transaction description."
// 	    }
// 	  ]
// 	}

rest.AddHeader('Authorization',sbAuth.GetAsString());
rest.AddHeader('Content-Type','application/json');

// Send the POST request containign the JSON in the request body, and get the JSON response.
sbJsonRequest := TChilkatStringBuilder.Create(Self);
json.EmitCompact := 1;
json.EmitSb(sbJsonRequest.ControlInterface);
sbJsonResponse := TChilkatStringBuilder.Create(Self);
success := rest.FullRequestSb('POST','/v1/payments/payment',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 201 success response?
if (rest.ResponseStatusCode <> 201) then
  begin
    Memo1.Lines.Add(json.Emit());
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

// Sample JSON response is shown below.
Memo1.Lines.Add(json.Emit());
Memo1.Lines.Add('success');

// ------------------------------------------------
// A sample JSON response:

// 	{ 
// 	  "id": "PAY-1XK50350XV338620BLA3CZGI",
// 	  "intent": "sale",
// 	  "state": "created",
// 	  "payer": { 
// 	    "payment_method": "paypal",
// 	    "use_vendor_currency_conversion": false
// 	  },
// 	  "transactions": [
// 	    { 
// 	      "amount": { 
// 	        "total": "7.47",
// 	        "currency": "USD"
// 	      },
// 	      "description": "This is the payment transaction description.",
// 	      "related_resources": [
// 	      ]
// 	    }
// 	  ],
// 	  "create_time": "2016-11-23T23:56:09Z",
// 	  "links": [
// 	    { 
// 	      "href": "https://api.sandbox.paypal.com/v1/payments/payment/PAY-1XK50350XV338620BLA3CZGI",
// 	      "rel": "self",
// 	      "method": "GET"
// 	    },
// 	    { 
// 	      "href": "https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token=EC-0BG932459F977083J",
// 	      "rel": "approval_url",
// 	      "method": "REDIRECT"
// 	    },
// 	    { 
// 	      "href": "https://api.sandbox.paypal.com/v1/payments/payment/PAY-1XK50350XV338620BLA3CZGI/execute",
// 	      "rel": "execute",
// 	      "method": "POST"
// 	    }
// 	  ]
// 	}
end;