Pascal (Lazarus/Delphi)

Paynow.pl -- Make a Payment Request

See more Paynow.pl Examples

Make a payment request POST with prepared message on Paynow payment request endpoint. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Http,
  Chilkat.HttpResponse,
  Chilkat.JsonObject,
  Chilkat.Crypt2;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  json: TJsonObject;
  myApiAccessKey: string;
  mySigCalcKey: string;
  crypt: TCrypt2;
  messageBody: string;
  signature: string;
  resp: THttpResponse;
  jsonResp: TJsonObject;
  redirectUrl: string;
  paymentId: string;
  status: string;

begin
  success := False;

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

  http := THttp.Create;

  //  Implements the following CURL command:

  //  curl --request POST 'https://api.sandbox.paynow.pl/v1/payments' \
  //  -H 'Content-Type: application/json' \
  //  -H 'Api-Key: c12c386b-650b-43db-9430-d84fc05d9433' \
  //  -H 'Signature: aYPCytCoc+/wFgqHZJjgBCi20omXTn0yzm9LysJgnFo=' \
  //  -H 'Idempotency-Key: 59c6dd26-f905-487b-96c9-fd1d2bd76885' \
  //  --data-raw '{
  //      "amount": 45671,
  //      "externalId": "234567898654",
  //      "description": "Test transaction",
  //      "buyer": {
  //          "email": "jan.kowalski@melements.pl"
  //      }
  //  }'

  //  Use the following online tool to generate HTTP code from a CURL command
  //  Convert a cURL Command to HTTP Source Code

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

  //  The following JSON is sent in the request body.

  //  {
  //    "amount": 45671,
  //    "externalId": "234567898654",
  //    "description": "Test transaction",
  //    "buyer": {
  //      "email": "jan.kowalski@melements.pl"
  //    }
  //  }

  json := TJsonObject.Create;
  json.UpdateInt('amount',45671);
  json.UpdateString('externalId','234567898654');
  json.UpdateString('description','Test transaction');
  json.UpdateString('buyer.email','jan.kowalski@melements.pl');

  myApiAccessKey := 'c12c386b-650b-43db-9430-d84fc05d9433';
  mySigCalcKey := 'b758f20d-ba92-44fa-acca-f57e99787b9d';

  //  Calculate the Signature header.
  crypt := TCrypt2.Create;
  crypt.MacAlgorithm := 'hmac';
  crypt.EncodingMode := 'base64';
  crypt.SetMacKeyString(mySigCalcKey);
  crypt.HashAlgorithm := 'SHA-256';
  messageBody := json.Emit();
  signature := crypt.MacStringENC(messageBody);

  http.SetRequestHeader('Idempotency-Key',crypt.GenerateUuid());
  http.SetRequestHeader('Api-Key',myApiAccessKey);
  http.SetRequestHeader('Signature',signature);
  http.SetRequestHeader('Content-Type','application/json');
  http.Accept := 'application/json';

  resp := THttpResponse.Create;
  success := http.HttpJson('POST','https://api.sandbox.paynow.pl/v1/payments',json,'application/json',resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  WriteLn('Response body:');
  WriteLn(resp.BodyStr);

  //  Sample response:
  //  {
  //    "redirectUrl": "https://paywall.sandbox.paynow.pl/NOA0-YJ9-Y1P-29V?token=eyJraWQiOiJhMD ... L60wk",
  //    "paymentId": "NOA0-YJ9-Y1P-29V",
  //    "status": "NEW"
  //  }

  jsonResp := TJsonObject.Create;
  jsonResp.Load(resp.BodyStr);
  redirectUrl := json.StringOf('redirectUrl');
  paymentId := json.StringOf('paymentId');
  status := json.StringOf('status');


  http.Free;
  json.Free;
  crypt.Free;
  resp.Free;
  jsonResp.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.