Pascal (Lazarus/Delphi)

Amazon Pay - Cancel Charge

See more Amazon Pay Examples

Moves Charge to Canceled state and releases any authorized payments. 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.StringBuilder,
  Chilkat.PrivateKey,
  Chilkat.HttpResponse,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  json: TJsonObject;
  sbRequestBody: TStringBuilder;
  privKey: TPrivateKey;
  publicKeyId: string;
  resp: THttpResponse;
  sbResponseBody: TStringBuilder;
  jResp: TJsonObject;
  respStatusCode: Integer;
  chargeId: string;
  chargePermissionId: string;
  chargeAmountAmount: string;
  chargeAmountCurrencyCode: string;
  captureAmountAmount: string;
  captureAmountCurrencyCode: string;
  refundedAmountAmount: string;
  refundedAmountCurrencyCode: string;
  convertedAmount: string;
  conversionRate: string;
  softDescriptor: string;
  merchantMetadata: string;
  providerMetadataProviderReferenceId: string;
  statusDetailsState: string;
  statusDetailsReasonCode: string;
  statusDetailsReasonDescription: string;
  statusDetailsLastUpdatedTimestamp: string;
  creationTimestamp: string;
  expirationTimestamp: string;
  releaseEnvironment: 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 "https://pay-api.amazon.com/:version/charges/:chargeId/cancel" \
  //  -X DELETE
  //  -H "authorization:Px2e5oHhQZ88vVhc0DO%2FsShHj8MDDg%3DEXAMPLESIGNATURE"
  //  -H "x-amz-pay-date:20201012T235046Z"
  //  -d '{
  //      "cancellationReason": "REASON DESCRIPTION"
  //  }'

  //  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.

  //  {
  //    "cancellationReason": "REASON DESCRIPTION"
  //  }

  json := TJsonObject.Create;
  json.UpdateString('cancellationReason','REASON DESCRIPTION');

  sbRequestBody := TStringBuilder.Create;
  json.EmitSb(sbRequestBody);

  //  Load your Amazon Pay private key.  
  //  There are many other ways to load private keys into the Chilkat private key object, such as from different formats,
  //  or from in-memory strings or bytes.
  privKey := TPrivateKey.Create;
  success := privKey.LoadPemFile('C:/someDir/myAmazonPayPrivateKey.pem');
  if (success = False) then
    begin
      WriteLn(privKey.LastErrorText);
      Exit;
    end;

  //  Provide your Amazon Pay private key and Public Key ID 
  //  Use your public key ID here.  It must be the one associated with the private key.
  publicKeyId := 'SANDBOX-AHEGSJCM3L2S637RBGABLAFW';
  success := http.SetAuthPrivateKey(publicKeyId,privKey);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  //  Note: When the private key is provided as shown above, Chilkat will automatically add the required x-amz-pay-* headers to the HTTP request,
  //  and will also sign the request.  Nothing more is needed.
  //  Chilkat automatically generates and adds the following headers:
  //  
  //  x-amz-pay-date
  //  x-amz-pay-host
  //  x-amz-pay-region
  //  Authorization

  http.Accept := 'application/json';

  //  Use the actual chargeId here:
  success := http.SetUrlVar('chargeId','bd504926-f659-4ad7-a1a9-9a747aaf5275');
  //  To use the live system, replace "sandbox" with "live" in the URL passed to HttpSb.
  //  Also, make sure to use the correct region: pay-api.amazon.com, pay-api.amazon.eu, or pay-api.amazon.jp
  resp := THttpResponse.Create;
  success := http.HttpSb('DELETE','https://pay-api.amazon.eu/sandbox/v2/charges/{$chargeId}/cancel',sbRequestBody,'utf-8','application/json',resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  sbResponseBody := TStringBuilder.Create;
  resp.GetBodySb(sbResponseBody);
  jResp := TJsonObject.Create;
  jResp.LoadSb(sbResponseBody);
  jResp.EmitCompact := False;

  //  If the status code is not equal to 200, this will display error information.
  WriteLn('Response Body:');
  WriteLn(jResp.Emit());

  respStatusCode := resp.StatusCode;
  WriteLn('Response Status Code = ' + respStatusCode);
  if (respStatusCode <> 200) then
    begin
      WriteLn('Failed.');
      Exit;
    end;

  //  Sample JSON response:
  //  (Sample code for parsing the JSON response is shown below)

  //  {
  //    "chargeId": "P21-1111111-1111111-C111111",
  //    "chargePermissionId": "P21-1111111-1111111",
  //    "chargeAmount": {
  //      "amount": "14.00",
  //      "currencyCode": "USD"
  //    },
  //    "captureAmount": {
  //      "amount": "14.00",
  //      "currencyCode": "USD"
  //    },
  //    "refundedAmount": {
  //      "amount": "0.00",
  //      "currencyCode": "USD"
  //    },
  //    "convertedAmount": "14.00",
  //    "conversionRate": "1.00",
  //    "softDescriptor": "SOFT DESCRIPTOR",
  //    "merchantMetadata": null,
  //    "providerMetadata": {
  //      "providerReferenceId": null
  //    },
  //    "statusDetails": {
  //      "state": "Canceled",
  //      "reasonCode": null,
  //      "reasonDescription": null,
  //      "lastUpdatedTimestamp": "20190714T155300Z"
  //    },
  //    "creationTimestamp": "20190714T155300Z",
  //    "expirationTimestamp": "20190715T155300Z",
  //    "releaseEnvironment": "Sandbox"
  //  }

  //  Sample code for parsing the JSON response...
  //  Use the following online tool to generate parsing code from sample JSON:
  //  Generate Parsing Code from JSON

  chargeId := jResp.StringOf('chargeId');
  chargePermissionId := jResp.StringOf('chargePermissionId');
  chargeAmountAmount := jResp.StringOf('chargeAmount.amount');
  chargeAmountCurrencyCode := jResp.StringOf('chargeAmount.currencyCode');
  captureAmountAmount := jResp.StringOf('captureAmount.amount');
  captureAmountCurrencyCode := jResp.StringOf('captureAmount.currencyCode');
  refundedAmountAmount := jResp.StringOf('refundedAmount.amount');
  refundedAmountCurrencyCode := jResp.StringOf('refundedAmount.currencyCode');
  convertedAmount := jResp.StringOf('convertedAmount');
  conversionRate := jResp.StringOf('conversionRate');
  softDescriptor := jResp.StringOf('softDescriptor');
  merchantMetadata := jResp.StringOf('merchantMetadata');
  providerMetadataProviderReferenceId := jResp.StringOf('providerMetadata.providerReferenceId');
  statusDetailsState := jResp.StringOf('statusDetails.state');
  statusDetailsReasonCode := jResp.StringOf('statusDetails.reasonCode');
  statusDetailsReasonDescription := jResp.StringOf('statusDetails.reasonDescription');
  statusDetailsLastUpdatedTimestamp := jResp.StringOf('statusDetails.lastUpdatedTimestamp');
  creationTimestamp := jResp.StringOf('creationTimestamp');
  expirationTimestamp := jResp.StringOf('expirationTimestamp');
  releaseEnvironment := jResp.StringOf('releaseEnvironment');


  http.Free;
  json.Free;
  sbRequestBody.Free;
  privKey.Free;
  resp.Free;
  sbResponseBody.Free;
  jResp.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.