(Delphi ActiveX) Amazon Pay - Complete Checkout Session

See more Amazon Pay Examples

Complete Checkout Session after the buyer returns to checkoutResultReturnUrl to finalize the paymentIntent.

For more information, see https://developer.amazon.com/docs/amazon-pay-api-v2/checkout-session.html#complete-checkout-session

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
http: TChilkatHttp;
success: Integer;
json: TChilkatJsonObject;
privKey: TPrivateKey;
publicKeyId: WideString;
resp: IChilkatHttpResponse;
sbResponseBody: TChilkatStringBuilder;
jResp: TChilkatJsonObject;
respStatusCode: Integer;
nullVal: Integer;
checkoutSessionId: WideString;
webCheckoutDetails: WideString;
chargePermissionType: WideString;
recurringMetadata: WideString;
productType: WideString;
paymentDetails: WideString;
merchantMetadata: WideString;
supplementaryData: WideString;
buyer: WideString;
billingAddress: WideString;
statusDetailsState: WideString;
statusDetailsReasonCode: WideString;
statusDetailsReasonDescription: WideString;
statusDetailsLastUpdatedTimestamp: WideString;
shippingAddress: WideString;
platformId: WideString;
chargePermissionId: WideString;
chargeId: WideString;
creationTimestamp: WideString;
expirationTimestamp: WideString;
storeId: WideString;
deliverySpecifications: WideString;
providerMetadata: WideString;
releaseEnvironment: WideString;
i: Integer;
count_i: Integer;

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

http := TChilkatHttp.Create(Self);

// Implements the following CURL command:

// curl "https://pay-api.amazon.com/:version/checkoutSessions/:checkoutSessionId/complete" \
// -X POST
// -H "authorization:Px2e5oHhQZ88vVhc0DO%2FsShHj8MDDg%3DEXAMPLESIGNATURE"
// -H "x-amz-pay-date:20201012T235046Z"
// -H "x-amz-pay-idempotency-key:AVLo5tI10BHgEk2jEXAMPLEKEY"
// -d '{
//     "chargeAmount": {
//         "amount": "14.00",
//         "currencyCode": "USD"
//     }
// }'

// 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.

// {
//   "chargeAmount": {
//     "amount": "14.00",
//     "currencyCode": "USD"
//   }
// }

json := TChilkatJsonObject.Create(Self);
json.UpdateString('chargeAmount.amount','14.00');
json.UpdateString('chargeAmount.currencyCode','USD');

// 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(Self);
success := privKey.LoadPemFile('C:/someDir/myAmazonPayPrivateKey.pem');
if (success = 0) then
  begin
    Memo1.Lines.Add(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.
// Note: The SetAuthPrivateKey method was added in Chilkat v9.5.0.89
publicKeyId := 'SANDBOX-AHEGSJCM3L2S637RBGABLAFW';
success := http.SetAuthPrivateKey(publicKeyId,privKey.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(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
// x-amz-pay-idempotency-key
// Authorization

http.Accept := 'application/json';

// To use the live system, replace "sandbox" with "live" in the URL passed to PTextSb.
// Also, make sure to use the correct region: pay-api.amazon.com, pay-api.amazon.eu, or pay-api.amazon.jp
success := http.SetUrlVar('sessionId','62b7d028-6c7c-4a43-b077-3897dff27c5b');
resp := http.PostJson3('https://pay-api.amazon.eu/sandbox/v2/checkoutSessions/{$sessionId}/complete','application/json',json.ControlInterface);
if (http.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

sbResponseBody := TChilkatStringBuilder.Create(Self);
resp.GetBodySb(sbResponseBody.ControlInterface);
jResp := TChilkatJsonObject.Create(Self);
jResp.LoadSb(sbResponseBody.ControlInterface);
jResp.EmitCompact := 0;

// If the status code is not equal to 200, this will display error information.
Memo1.Lines.Add('Response Body:');
Memo1.Lines.Add(jResp.Emit());

respStatusCode := resp.StatusCode;
Memo1.Lines.Add('Response Status Code = ' + IntToStr(respStatusCode));
if (respStatusCode <> 200) then
  begin

    // A sample response body for the case where the session ID does not exist:
    // 	{
    // 	  "reasonCode": "ResourceNotFound",
    // 	  "message": "Resource you are trying to access is not available. Requested path '/sandbox/v2/checkoutSessions/bd504926-f659-4ad7-a1a9-9a747aaf5275'"
    // 	}

    // Another sample failure response (status code = 422)
    // 	{
    // 	  "reasonCode": "InvalidCheckoutSessionStatus",
    // 	  "message": "You tried to call an operation on a Checkout Session that is in a state where that operation is not allowed"
    // 	}

    Memo1.Lines.Add('Failed.');

    Exit;
  end;

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

// {
//   "checkoutSessionId": "bd504926-f659-4ad7-a1a9-9a747aaf5275",
//   "webCheckoutDetails": null,
//   "chargePermissionType": "OneTime",
//   "recurringMetadata": null,
//   "productType": null,
//   "paymentDetails": null,
//   "merchantMetadata": null,
//   "supplementaryData": null,
//   "buyer": null,
//   "billingAddress": null,
//   "paymentPreferences": [
//     null
//   ],
//   "statusDetails": {
//     "state": "Completed",
//     "reasonCode": null,
//     "reasonDescription": null,
//     "lastUpdatedTimestamp": "20191015T204327Z"
//   },
//   "shippingAddress": null,
//   "platformId": null,
//   "chargePermissionId": "S01-5105180-3221187",
//   "chargeId": "S01-5105180-3221187-C056351",
//   "constraints": [
//     null
//   ],
//   "creationTimestamp": "20191015T204313Z",
//   "expirationTimestamp": null,
//   "storeId": null,
//   "deliverySpecifications": null,
//   "providerMetadata": null,
//   "releaseEnvironment": null
// }

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

checkoutSessionId := jResp.StringOf('checkoutSessionId');
webCheckoutDetails := jResp.StringOf('webCheckoutDetails');
chargePermissionType := jResp.StringOf('chargePermissionType');
recurringMetadata := jResp.StringOf('recurringMetadata');
productType := jResp.StringOf('productType');
paymentDetails := jResp.StringOf('paymentDetails');
merchantMetadata := jResp.StringOf('merchantMetadata');
supplementaryData := jResp.StringOf('supplementaryData');
buyer := jResp.StringOf('buyer');
billingAddress := jResp.StringOf('billingAddress');
statusDetailsState := jResp.StringOf('statusDetails.state');
statusDetailsReasonCode := jResp.StringOf('statusDetails.reasonCode');
statusDetailsReasonDescription := jResp.StringOf('statusDetails.reasonDescription');
statusDetailsLastUpdatedTimestamp := jResp.StringOf('statusDetails.lastUpdatedTimestamp');
shippingAddress := jResp.StringOf('shippingAddress');
platformId := jResp.StringOf('platformId');
chargePermissionId := jResp.StringOf('chargePermissionId');
chargeId := jResp.StringOf('chargeId');
creationTimestamp := jResp.StringOf('creationTimestamp');
expirationTimestamp := jResp.StringOf('expirationTimestamp');
storeId := jResp.StringOf('storeId');
deliverySpecifications := jResp.StringOf('deliverySpecifications');
providerMetadata := jResp.StringOf('providerMetadata');
releaseEnvironment := jResp.StringOf('releaseEnvironment');
i := 0;
count_i := jResp.SizeOfArray('paymentPreferences');
while i < count_i do
  begin
    jResp.I := i;
    nullVal := jResp.IsNullOf('paymentPreferences[i]');
    i := i + 1;
  end;

i := 0;
count_i := jResp.SizeOfArray('constraints');
while i < count_i do
  begin
    jResp.I := i;
    nullVal := jResp.IsNullOf('constraints[i]');
    i := i + 1;
  end;
end;