(C#) Amazon Pay - Create Checkout Session

See more Amazon Pay Examples

Create a new Amazon Pay Checkout Session.

Note: This example requires Chilkat v9.5.0.89 or later. Contact support@chilkatsoft.com to get a v9.5.0.89 pre-release for testing.

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

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

Chilkat.Http http = new Chilkat.Http();
bool success;

// Implements the following CURL command:

// curl "https://pay-api.amazon.com/:version/checkoutSessions/" \
// -X POST
// -H "authorization:Px2e5oHhQZ88vVhc0DO%2FsShHj8MDDg%3DEXAMPLESIGNATURE"
// -H "x-amz-pay-date:20201012T235046Z"
// -H "x-amz-pay-idempotency-key:AVLo5tI10BHgEk2jEXAMPLEKEY"
// -d '{
//     "webCheckoutDetails": {
//         "checkoutReviewReturnUrl": "https://a.com/merchant-review-page"
//     },
//     "storeId": "amzn1.application-oa2-client.8b5e45312b5248b69eeaStoreId",
//     "scopes": ["name", "email", "phoneNumber", "billingAddress"],
//     "deliverySpecifications": {
//         "specialRestrictions": ["RestrictPOBoxes"],
//         "addressRestrictions": {
//             "type": "Allowed",
//             "restrictions": {
//                 "US": {
//                     "statesOrRegions": ["WA"],
//                     "zipCodes": ["95050", "93405"]
//                 },
//                 "GB": {
//                     "zipCodes": ["72046", "72047"]
//                 },
//                 "IN": {
//                     "statesOrRegions": ["AP"]
//                 },
//                 "JP": {}
//             }
//         }
//     }
// }'

// 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.

// {
//   "webCheckoutDetails": {
//     "checkoutReviewReturnUrl": "https://a.com/merchant-review-page"
//   },
//   "storeId": "amzn1.application-oa2-client.8b5e45312b5248b69eeaStoreId",
//   "scopes": [
//     "name",
//     "email",
//     "phoneNumber",
//     "billingAddress"
//   ],
//   "deliverySpecifications": {
//     "specialRestrictions": [
//       "RestrictPOBoxes"
//     ],
//     "addressRestrictions": {
//       "type": "Allowed",
//       "restrictions": {
//         "US": {
//           "statesOrRegions": [
//             "WA"
//           ],
//           "zipCodes": [
//             "95050",
//             "93405"
//           ]
//         },
//         "GB": {
//           "zipCodes": [
//             "72046",
//             "72047"
//           ]
//         },
//         "IN": {
//           "statesOrRegions": [
//             "AP"
//           ]
//         },
//         "JP": {}
//       }
//     }
//   }
// }

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.UpdateString("webCheckoutDetails.checkoutReviewReturnUrl","https://a.com/merchant-review-page");
// Make sure to use your storeId here:
json.UpdateString("storeId","amzn1.application-oa2-client.8b5e45312b5248b69eeaStoreId");
int i = 0;
json.I = i;
json.UpdateString("scopes[i]","name");
i = i + 1;
json.I = i;
json.UpdateString("scopes[i]","email");
i = i + 1;
json.I = i;
json.UpdateString("scopes[i]","phoneNumber");
i = i + 1;
json.I = i;
json.UpdateString("scopes[i]","billingAddress");
json.UpdateString("deliverySpecifications.specialRestrictions[0]","RestrictPOBoxes");
json.UpdateString("deliverySpecifications.addressRestrictions.type","Allowed");
json.UpdateString("deliverySpecifications.addressRestrictions.restrictions.US.statesOrRegions[0]","WA");
json.UpdateString("deliverySpecifications.addressRestrictions.restrictions.US.zipCodes[0]","95050");
json.UpdateString("deliverySpecifications.addressRestrictions.restrictions.US.zipCodes[1]","93405");
json.UpdateString("deliverySpecifications.addressRestrictions.restrictions.GB.zipCodes[0]","72046");
json.UpdateString("deliverySpecifications.addressRestrictions.restrictions.GB.zipCodes[1]","72047");
json.UpdateString("deliverySpecifications.addressRestrictions.restrictions.IN.statesOrRegions[0]","AP");
json.UpdateNewObject("deliverySpecifications.addressRestrictions.restrictions.JP");

// 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.
Chilkat.PrivateKey privKey = new Chilkat.PrivateKey();
success = privKey.LoadPemFile("C:/someDir/myAmazonPayPrivateKey.pem");
if (success == false) {
    Debug.WriteLine(privKey.LastErrorText);
    return;
}

// 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
string publicKeyId = "SANDBOX-AHEGSJCM3L2S637RBGABLAFW";
success = http.SetAuthPrivateKey(publicKeyId,privKey);
if (success == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

// 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 PostJson3.
// Also, make sure to use the correct region: pay-api.amazon.com, pay-api.amazon.eu, or pay-api.amazon.jp
Chilkat.HttpResponse resp = http.PostJson3("https://pay-api.amazon.eu/sandbox/v2/checkoutSessions/","application/json",json);
if (http.LastMethodSuccess == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Chilkat.StringBuilder sbResponseBody = new Chilkat.StringBuilder();
resp.GetBodySb(sbResponseBody);
Chilkat.JsonObject jResp = new Chilkat.JsonObject();
jResp.LoadSb(sbResponseBody);
jResp.EmitCompact = false;

// If the status code is not equal to 201, this will display error information.
Debug.WriteLine("Response Body:");
Debug.WriteLine(jResp.Emit());

int respStatusCode = resp.StatusCode;
Debug.WriteLine("Response Status Code = " + Convert.ToString(respStatusCode));
if (respStatusCode != 201) {

    // The jResp would've contained an error message, similar to this:
    // 	{
    // 	  "reasonCode": "InvalidHeaderValue",
    // 	  "message": "The value AF2EGWREIPHV2S2TUFFBRDGM provided for PublicKeyId is invalid. Please verify that you are using the PublicKeyId in the correct region and environment."
    // 	}

    Debug.WriteLine("Failed.");

    return;
}

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

// {
//   "checkoutSessionId": "bd504926-f659-4ad7-a1a9-9a747aaf5275",
//   "webCheckoutDetails": {
//     "checkoutReviewReturnUrl": "https://a.com/merchant-review-page",
//     "checkoutResultReturnUrl": null,
//     "checkoutCancelUrl": null,
//     "amazonPayRedirectUrl": null
//   },
//   "productType": "PayAndShip",
//   "chargePermissionType": "Recurring",
//   "recurringMetadata": {
//     "frequency": {
//       "unit": "Month",
//       "value": "1"
//     },
//     "amount": {
//       "amount": "30",
//       "currencyCode": "USD"
//     }
//   },
//   "paymentDetails": {
//     "paymentIntent": null,
//     "canHandlePendingAuthorization": false,
//     "chargeAmount": null,
//     "totalOrderAmount": null,
//     "softDescriptor": null,
//     "presentmentCurrency": null,
//     "allowOvercharge": null,
//     "extendExpiration": null
//   },
//   "merchantMetadata": {
//     "merchantReferenceId": null,
//     "merchantStoreName": null,
//     "noteToBuyer": null,
//     "customInformation": null
//   },
//   "supplementaryData": null,
//   "buyer": null,
//   "billingAddress": null,
//   "paymentPreferences": [
//     null
//   ],
//   "statusDetails": {
//     "state": "Open",
//     "reasonCode": null,
//     "reasonDescription": null,
//     "lastUpdatedTimestamp": "20191015T204327Z"
//   },
//   "shippingAddress": null,
//   "platformId": null,
//   "chargePermissionId": null,
//   "chargeId": null,
//   "constraints": [
//     {
//       "constraintId": "BuyerNotAssociated",
//       "description": "There is no buyer associated with the Checkout Session. Return the checkout session id to the Amazon Pay Button to allow buyer to login."
//     },
//     {
//       "constraintId": "ChargeAmountNotSet",
//       "description": "chargeAmount is not set."
//     },
//     {
//       "constraintId": "CheckoutResultReturnUrlNotSet",
//       "description": "checkoutResultReturnUrl is not set."
//     },
//     {
//       "constraintId": "PaymentIntentNotSet",
//       "description": "paymentIntent is not set."
//     }
//   ],
//   "creationTimestamp": "20191015T204313Z",
//   "expirationTimestamp": "20191016T204313Z",
//   "storeId": "amzn1.application-oa2-client.8b5e45312b5248b69eeaStoreId",
//   "deliverySpecifications": {
//     "specialRestrictions": [
//       "RestrictPOBoxes"
//     ],
//     "addressRestrictions": {
//       "type": "Allowed",
//       "restrictions": {
//         "US": {
//           "statesOrRegions": [
//             "WA"
//           ],
//           "zipCodes": [
//             "95050",
//             "93405"
//           ]
//         },
//         "GB": {
//           "zipCodes": [
//             "72046",
//             "72047"
//           ]
//         },
//         "IN": {
//           "statesOrRegions": [
//             "AP"
//           ]
//         },
//         "JP": {}
//       }
//     }
//   },
//   "providerMetadata": {
//     "providerReferenceId": null
//   },
//   "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

bool nullVal;
string constraintId;
string description;
string strVal;

string checkoutSessionId = jResp.StringOf("checkoutSessionId");
string webCheckoutDetailsCheckoutReviewReturnUrl = jResp.StringOf("webCheckoutDetails.checkoutReviewReturnUrl");
string webCheckoutDetailsCheckoutResultReturnUrl = jResp.StringOf("webCheckoutDetails.checkoutResultReturnUrl");
string webCheckoutDetailsCheckoutCancelUrl = jResp.StringOf("webCheckoutDetails.checkoutCancelUrl");
string webCheckoutDetailsAmazonPayRedirectUrl = jResp.StringOf("webCheckoutDetails.amazonPayRedirectUrl");
string productType = jResp.StringOf("productType");
string chargePermissionType = jResp.StringOf("chargePermissionType");
string recurringMetadataFrequencyUnit = jResp.StringOf("recurringMetadata.frequency.unit");
string recurringMetadataFrequencyValue = jResp.StringOf("recurringMetadata.frequency.value");
string recurringMetadataAmountAmount = jResp.StringOf("recurringMetadata.amount.amount");
string recurringMetadataAmountCurrencyCode = jResp.StringOf("recurringMetadata.amount.currencyCode");
string paymentDetailsPaymentIntent = jResp.StringOf("paymentDetails.paymentIntent");
bool paymentDetailsCanHandlePendingAuthorization = jResp.BoolOf("paymentDetails.canHandlePendingAuthorization");
string paymentDetailsChargeAmount = jResp.StringOf("paymentDetails.chargeAmount");
string paymentDetailsTotalOrderAmount = jResp.StringOf("paymentDetails.totalOrderAmount");
string paymentDetailsSoftDescriptor = jResp.StringOf("paymentDetails.softDescriptor");
string paymentDetailsPresentmentCurrency = jResp.StringOf("paymentDetails.presentmentCurrency");
string paymentDetailsAllowOvercharge = jResp.StringOf("paymentDetails.allowOvercharge");
string paymentDetailsExtendExpiration = jResp.StringOf("paymentDetails.extendExpiration");
string merchantMetadataMerchantReferenceId = jResp.StringOf("merchantMetadata.merchantReferenceId");
string merchantMetadataMerchantStoreName = jResp.StringOf("merchantMetadata.merchantStoreName");
string merchantMetadataNoteToBuyer = jResp.StringOf("merchantMetadata.noteToBuyer");
string merchantMetadataCustomInformation = jResp.StringOf("merchantMetadata.customInformation");
string supplementaryData = jResp.StringOf("supplementaryData");
string buyer = jResp.StringOf("buyer");
string billingAddress = jResp.StringOf("billingAddress");
string statusDetailsState = jResp.StringOf("statusDetails.state");
string statusDetailsReasonCode = jResp.StringOf("statusDetails.reasonCode");
string statusDetailsReasonDescription = jResp.StringOf("statusDetails.reasonDescription");
string statusDetailsLastUpdatedTimestamp = jResp.StringOf("statusDetails.lastUpdatedTimestamp");
string shippingAddress = jResp.StringOf("shippingAddress");
string platformId = jResp.StringOf("platformId");
string chargePermissionId = jResp.StringOf("chargePermissionId");
string chargeId = jResp.StringOf("chargeId");
string creationTimestamp = jResp.StringOf("creationTimestamp");
string expirationTimestamp = jResp.StringOf("expirationTimestamp");
string storeId = jResp.StringOf("storeId");
string deliverySpecificationsAddressRestrictionsType = jResp.StringOf("deliverySpecifications.addressRestrictions.type");
string providerMetadataProviderReferenceId = jResp.StringOf("providerMetadata.providerReferenceId");
string releaseEnvironment = jResp.StringOf("releaseEnvironment");
i = 0;
int count_i = jResp.SizeOfArray("paymentPreferences");
while (i < count_i) {
    jResp.I = i;
    nullVal = jResp.IsNullOf("paymentPreferences[i]");
    i = i + 1;
}

i = 0;
count_i = jResp.SizeOfArray("constraints");
while (i < count_i) {
    jResp.I = i;
    constraintId = jResp.StringOf("constraints[i].constraintId");
    description = jResp.StringOf("constraints[i].description");
    i = i + 1;
}

i = 0;
count_i = jResp.SizeOfArray("deliverySpecifications.specialRestrictions");
while (i < count_i) {
    jResp.I = i;
    strVal = jResp.StringOf("deliverySpecifications.specialRestrictions[i]");
    i = i + 1;
}

i = 0;
count_i = jResp.SizeOfArray("deliverySpecifications.addressRestrictions.restrictions.US.statesOrRegions");
while (i < count_i) {
    jResp.I = i;
    strVal = jResp.StringOf("deliverySpecifications.addressRestrictions.restrictions.US.statesOrRegions[i]");
    i = i + 1;
}

i = 0;
count_i = jResp.SizeOfArray("deliverySpecifications.addressRestrictions.restrictions.US.zipCodes");
while (i < count_i) {
    jResp.I = i;
    strVal = jResp.StringOf("deliverySpecifications.addressRestrictions.restrictions.US.zipCodes[i]");
    i = i + 1;
}

i = 0;
count_i = jResp.SizeOfArray("deliverySpecifications.addressRestrictions.restrictions.GB.zipCodes");
while (i < count_i) {
    jResp.I = i;
    strVal = jResp.StringOf("deliverySpecifications.addressRestrictions.restrictions.GB.zipCodes[i]");
    i = i + 1;
}

i = 0;
count_i = jResp.SizeOfArray("deliverySpecifications.addressRestrictions.restrictions.IN.statesOrRegions");
while (i < count_i) {
    jResp.I = i;
    strVal = jResp.StringOf("deliverySpecifications.addressRestrictions.restrictions.IN.statesOrRegions[i]");
    i = i + 1;
}