(Xojo Plugin) 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.

Dim http As New Chilkat.Http
Dim success As Boolean

// 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": {}
//       }
//     }
//   }
// }

Dim json As New Chilkat.JsonObject
success = json.UpdateString("webCheckoutDetails.checkoutReviewReturnUrl","https://a.com/merchant-review-page")
// Make sure to use your storeId here:
success = json.UpdateString("storeId","amzn1.application-oa2-client.8b5e45312b5248b69eeaStoreId")
Dim i As Int32
i = 0
json.I = i
success = json.UpdateString("scopes[i]","name")
i = i + 1
json.I = i
success = json.UpdateString("scopes[i]","email")
i = i + 1
json.I = i
success = json.UpdateString("scopes[i]","phoneNumber")
i = i + 1
json.I = i
success = json.UpdateString("scopes[i]","billingAddress")
success = json.UpdateString("deliverySpecifications.specialRestrictions[0]","RestrictPOBoxes")
success = json.UpdateString("deliverySpecifications.addressRestrictions.type","Allowed")
success = json.UpdateString("deliverySpecifications.addressRestrictions.restrictions.US.statesOrRegions[0]","WA")
success = json.UpdateString("deliverySpecifications.addressRestrictions.restrictions.US.zipCodes[0]","95050")
success = json.UpdateString("deliverySpecifications.addressRestrictions.restrictions.US.zipCodes[1]","93405")
success = json.UpdateString("deliverySpecifications.addressRestrictions.restrictions.GB.zipCodes[0]","72046")
success = json.UpdateString("deliverySpecifications.addressRestrictions.restrictions.GB.zipCodes[1]","72047")
success = json.UpdateString("deliverySpecifications.addressRestrictions.restrictions.IN.statesOrRegions[0]","AP")
success = 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.
Dim privKey As New Chilkat.PrivateKey
success = privKey.LoadPemFile("C:/someDir/myAmazonPayPrivateKey.pem")
If (success = False) Then
    System.DebugLog(privKey.LastErrorText)
    Return
End If

// 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
Dim publicKeyId As String
publicKeyId = "SANDBOX-AHEGSJCM3L2S637RBGABLAFW"
success = http.SetAuthPrivateKey(publicKeyId,privKey)
If (success = False) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

// 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
Dim resp As Chilkat.HttpResponse
resp = http.PostJson3("https://pay-api.amazon.eu/sandbox/v2/checkoutSessions/","application/json",json)
If (http.LastMethodSuccess = False) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

Dim sbResponseBody As New Chilkat.StringBuilder
success = resp.GetBodySb(sbResponseBody)
Dim jResp As New Chilkat.JsonObject
success = jResp.LoadSb(sbResponseBody)
jResp.EmitCompact = False

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

Dim respStatusCode As Int32
respStatusCode = resp.StatusCode
System.DebugLog("Response Status Code = " + Str(respStatusCode))
If (respStatusCode <> 201) Then

    // 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."
    // 	}

    System.DebugLog("Failed.")

    Return
End If

// 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

Dim nullVal As Boolean
Dim constraintId As String
Dim description As String
Dim strVal As String

Dim checkoutSessionId As String
checkoutSessionId = jResp.StringOf("checkoutSessionId")
Dim webCheckoutDetailsCheckoutReviewReturnUrl As String
webCheckoutDetailsCheckoutReviewReturnUrl = jResp.StringOf("webCheckoutDetails.checkoutReviewReturnUrl")
Dim webCheckoutDetailsCheckoutResultReturnUrl As String
webCheckoutDetailsCheckoutResultReturnUrl = jResp.StringOf("webCheckoutDetails.checkoutResultReturnUrl")
Dim webCheckoutDetailsCheckoutCancelUrl As String
webCheckoutDetailsCheckoutCancelUrl = jResp.StringOf("webCheckoutDetails.checkoutCancelUrl")
Dim webCheckoutDetailsAmazonPayRedirectUrl As String
webCheckoutDetailsAmazonPayRedirectUrl = jResp.StringOf("webCheckoutDetails.amazonPayRedirectUrl")
Dim productType As String
productType = jResp.StringOf("productType")
Dim chargePermissionType As String
chargePermissionType = jResp.StringOf("chargePermissionType")
Dim recurringMetadataFrequencyUnit As String
recurringMetadataFrequencyUnit = jResp.StringOf("recurringMetadata.frequency.unit")
Dim recurringMetadataFrequencyValue As String
recurringMetadataFrequencyValue = jResp.StringOf("recurringMetadata.frequency.value")
Dim recurringMetadataAmountAmount As String
recurringMetadataAmountAmount = jResp.StringOf("recurringMetadata.amount.amount")
Dim recurringMetadataAmountCurrencyCode As String
recurringMetadataAmountCurrencyCode = jResp.StringOf("recurringMetadata.amount.currencyCode")
Dim paymentDetailsPaymentIntent As String
paymentDetailsPaymentIntent = jResp.StringOf("paymentDetails.paymentIntent")
Dim paymentDetailsCanHandlePendingAuthorization As Boolean
paymentDetailsCanHandlePendingAuthorization = jResp.BoolOf("paymentDetails.canHandlePendingAuthorization")
Dim paymentDetailsChargeAmount As String
paymentDetailsChargeAmount = jResp.StringOf("paymentDetails.chargeAmount")
Dim paymentDetailsTotalOrderAmount As String
paymentDetailsTotalOrderAmount = jResp.StringOf("paymentDetails.totalOrderAmount")
Dim paymentDetailsSoftDescriptor As String
paymentDetailsSoftDescriptor = jResp.StringOf("paymentDetails.softDescriptor")
Dim paymentDetailsPresentmentCurrency As String
paymentDetailsPresentmentCurrency = jResp.StringOf("paymentDetails.presentmentCurrency")
Dim paymentDetailsAllowOvercharge As String
paymentDetailsAllowOvercharge = jResp.StringOf("paymentDetails.allowOvercharge")
Dim paymentDetailsExtendExpiration As String
paymentDetailsExtendExpiration = jResp.StringOf("paymentDetails.extendExpiration")
Dim merchantMetadataMerchantReferenceId As String
merchantMetadataMerchantReferenceId = jResp.StringOf("merchantMetadata.merchantReferenceId")
Dim merchantMetadataMerchantStoreName As String
merchantMetadataMerchantStoreName = jResp.StringOf("merchantMetadata.merchantStoreName")
Dim merchantMetadataNoteToBuyer As String
merchantMetadataNoteToBuyer = jResp.StringOf("merchantMetadata.noteToBuyer")
Dim merchantMetadataCustomInformation As String
merchantMetadataCustomInformation = jResp.StringOf("merchantMetadata.customInformation")
Dim supplementaryData As String
supplementaryData = jResp.StringOf("supplementaryData")
Dim buyer As String
buyer = jResp.StringOf("buyer")
Dim billingAddress As String
billingAddress = jResp.StringOf("billingAddress")
Dim statusDetailsState As String
statusDetailsState = jResp.StringOf("statusDetails.state")
Dim statusDetailsReasonCode As String
statusDetailsReasonCode = jResp.StringOf("statusDetails.reasonCode")
Dim statusDetailsReasonDescription As String
statusDetailsReasonDescription = jResp.StringOf("statusDetails.reasonDescription")
Dim statusDetailsLastUpdatedTimestamp As String
statusDetailsLastUpdatedTimestamp = jResp.StringOf("statusDetails.lastUpdatedTimestamp")
Dim shippingAddress As String
shippingAddress = jResp.StringOf("shippingAddress")
Dim platformId As String
platformId = jResp.StringOf("platformId")
Dim chargePermissionId As String
chargePermissionId = jResp.StringOf("chargePermissionId")
Dim chargeId As String
chargeId = jResp.StringOf("chargeId")
Dim creationTimestamp As String
creationTimestamp = jResp.StringOf("creationTimestamp")
Dim expirationTimestamp As String
expirationTimestamp = jResp.StringOf("expirationTimestamp")
Dim storeId As String
storeId = jResp.StringOf("storeId")
Dim deliverySpecificationsAddressRestrictionsType As String
deliverySpecificationsAddressRestrictionsType = jResp.StringOf("deliverySpecifications.addressRestrictions.type")
Dim providerMetadataProviderReferenceId As String
providerMetadataProviderReferenceId = jResp.StringOf("providerMetadata.providerReferenceId")
Dim releaseEnvironment As String
releaseEnvironment = jResp.StringOf("releaseEnvironment")
i = 0
Dim count_i As Int32
count_i = jResp.SizeOfArray("paymentPreferences")
While i < count_i
    jResp.I = i
    nullVal = jResp.IsNullOf("paymentPreferences[i]")
    i = i + 1
Wend
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
Wend
i = 0
count_i = jResp.SizeOfArray("deliverySpecifications.specialRestrictions")
While i < count_i
    jResp.I = i
    strVal = jResp.StringOf("deliverySpecifications.specialRestrictions[i]")
    i = i + 1
Wend
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
Wend
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
Wend
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
Wend
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
Wend