(VB.NET UWP/WinRT) Amazon Pay - Update Checkout Session

See more Amazon Pay Examples

Update the Checkout Session with transaction details.

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

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

' 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/:checkoutSessionId" \
' -X PATCH
' -H "authorization:Px2e5oHhQZ88vVhc0DO%2FsShHj8MDDg%3DEXAMPLESIGNATURE"
' -H "x-amz-pay-date:20201012T235046Z"
' -d '{
'     "webCheckoutDetails": {
'         "checkoutResultReturnUrl": "https://a.com/merchant-confirm-page"
'     },
'     "paymentDetails": {
'         "paymentIntent": "AuthorizeWithCapture",
'         "canHandlePendingAuthorization":false,
'         "softDescriptor": "Descriptor",
'         "chargeAmount": {
'             "amount": "1",
'             "currencyCode": "USD"
'         }
'      },
'     "merchantMetadata": {
'         "merchantReferenceId": "Merchant reference ID",
'         "merchantStoreName": "Merchant store name",
'         "noteToBuyer": "Note to buyer",
'         "customInformation": "Custom information"
'     }
' }'

' 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": {
'     "checkoutResultReturnUrl": "https://a.com/merchant-confirm-page"
'   },
'   "paymentDetails": {
'     "paymentIntent": "AuthorizeWithCapture",
'     "canHandlePendingAuthorization": false,
'     "softDescriptor": "Descriptor",
'     "chargeAmount": {
'       "amount": "1",
'       "currencyCode": "USD"
'     }
'   },
'   "merchantMetadata": {
'     "merchantReferenceId": "Merchant reference ID",
'     "merchantStoreName": "Merchant store name",
'     "noteToBuyer": "Note to buyer",
'     "customInformation": "Custom information"
'   }
' }

Dim json As New Chilkat.JsonObject
json.UpdateString("webCheckoutDetails.checkoutResultReturnUrl","https://a.com/merchant-confirm-page")
json.UpdateString("paymentDetails.paymentIntent","AuthorizeWithCapture")
json.UpdateBool("paymentDetails.canHandlePendingAuthorization",False)
json.UpdateString("paymentDetails.softDescriptor","Descriptor")
json.UpdateString("paymentDetails.chargeAmount.amount","1")
json.UpdateString("paymentDetails.chargeAmount.currencyCode","USD")
json.UpdateString("merchantMetadata.merchantReferenceId","Merchant reference ID")
json.UpdateString("merchantMetadata.merchantStoreName","Merchant store name")
json.UpdateString("merchantMetadata.noteToBuyer","Note to buyer")
json.UpdateString("merchantMetadata.customInformation","Custom information")


Dim sbRequestBody As New Chilkat.StringBuilder
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.
Dim privKey As New Chilkat.PrivateKey
success = privKey.LoadPemFile("C:/someDir/myAmazonPayPrivateKey.pem")
If (success = False) Then
    Debug.WriteLine(privKey.LastErrorText)
    Exit Sub
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 = "SANDBOX-AHEGSJCM3L2S637RBGABLAFW"
success = http.SetAuthPrivateKey(publicKeyId,privKey)
If (success = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
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
' Authorization

http.Accept = "application/json"


success = http.SetUrlVar("sessionId","62b7d028-6c7c-4a43-b077-3897dff27c5b")
' 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
Dim resp As Chilkat.HttpResponse = Await http.PTextSbAsync("PATCH","https://pay-api.amazon.eu/sandbox/v2/checkoutSessions/{$sessionId}",sbRequestBody,"utf-8","application/json",False,False)
If (http.LastMethodSuccess = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


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

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

Dim respStatusCode As Integer = resp.StatusCode
Debug.WriteLine("Response Status Code = " & respStatusCode)
If (respStatusCode <> 200) Then

    ' 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'"
    ' 	}

    Debug.WriteLine("Failed.")

    Exit Sub
End If



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

' {
'   "checkoutSessionId": "ada3f397-7d4b-4a55-abac-786685c02d8b",
'   "webCheckoutDetails": {
'     "checkoutReviewReturnUrl": "https://a.com/merchant-review-page",
'     "checkoutResultReturnUrl": "https://a.com/merchant-confirm-page",
'     "checkoutCancelUrl": null,
'     "amazonPayRedirectUrl": "https://pay.amazon.com/redirect/checkoutId-1"
'   },
'   "productType": "PayAndShip",
'   "paymentDetails": {
'     "paymentIntent": "AuthorizeWithCapture",
'     "canHandlePendingAuthorization": false,
'     "chargeAmount": {
'       "amount": "1",
'       "currencyCode": "USD"
'     },
'     "totalOrderAmount": null,
'     "softDescriptor": "Descriptor",
'     "presentmentCurrency": "USD",
'     "allowOvercharge": null,
'     "extendExpiration": null
'   },
'   "merchantMetadata": {
'     "merchantReferenceId": "Merchant reference ID",
'     "merchantStoreName": "Merchant store name",
'     "noteToBuyer": "Note to buyer",
'     "customInformation": "Custom information"
'   },
'   "supplementaryData": null,
'   "buyer": {
'     "buyerId": "buyerId",
'     "name": "name-1",
'     "email": "name@amazon.com",
'     "phoneNumber": "800-000-0000",
'     "primeMembershipTypes": null
'   },
'   "billingAddress": {
'     "name": "Work",
'     "addressLine1": "440 Terry Ave",
'     "addressLine2": "",
'     "addressLine3": "",
'     "city": "Seattle",
'     "county": "King",
'     "district": "Seattle",
'     "stateOrRegion": "WA",
'     "postalCode": "98121",
'     "countryCode": "US"
'   },
'   "paymentPreferences": [
'     {
'       "paymentDescriptor": "Your selected Amazon payment method"
'     }
'   ],
'   "statusDetails": {
'     "state": "Open",
'     "reasonCode": null,
'     "reasonDescription": null,
'     "lastUpdatedTimestamp": "20191015T195703Z"
'   },
'   "shippingAddress": {
'     "name": "Susie Smith",
'     "addressLine1": "10 Ditka Ave",
'     "addressLine2": "Suite 2500",
'     "addressLine3": null,
'     "city": "Chicago",
'     "county": null,
'     "district": null,
'     "stateOrRegion": "IL",
'     "postalCode": "60602",
'     "countryCode": "US",
'     "phoneNumber": "800-000-0000"
'   },
'   "platformId": null,
'   "chargePermissionId": null,
'   "chargeId": null,
'   "constraints": [
'   ],
'   "creationTimestamp": "20191015T195655Z",
'   "expirationTimestamp": "20191016T195655Z",
'   "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 paymentDescriptor As String
Dim strVal As String

Dim checkoutSessionId As String = jResp.StringOf("checkoutSessionId")
Dim webCheckoutDetailsCheckoutReviewReturnUrl As String = jResp.StringOf("webCheckoutDetails.checkoutReviewReturnUrl")
Dim webCheckoutDetailsCheckoutResultReturnUrl As String = jResp.StringOf("webCheckoutDetails.checkoutResultReturnUrl")
Dim webCheckoutDetailsCheckoutCancelUrl As String = jResp.StringOf("webCheckoutDetails.checkoutCancelUrl")
Dim webCheckoutDetailsAmazonPayRedirectUrl As String = jResp.StringOf("webCheckoutDetails.amazonPayRedirectUrl")
Dim productType As String = jResp.StringOf("productType")
Dim paymentDetailsPaymentIntent As String = jResp.StringOf("paymentDetails.paymentIntent")
Dim paymentDetailsCanHandlePendingAuthorization As Boolean = jResp.BoolOf("paymentDetails.canHandlePendingAuthorization")
Dim paymentDetailsChargeAmountAmount As String = jResp.StringOf("paymentDetails.chargeAmount.amount")
Dim paymentDetailsChargeAmountCurrencyCode As String = jResp.StringOf("paymentDetails.chargeAmount.currencyCode")
Dim paymentDetailsTotalOrderAmount As String = jResp.StringOf("paymentDetails.totalOrderAmount")
Dim paymentDetailsSoftDescriptor As String = jResp.StringOf("paymentDetails.softDescriptor")
Dim paymentDetailsPresentmentCurrency As String = jResp.StringOf("paymentDetails.presentmentCurrency")
Dim paymentDetailsAllowOvercharge As String = jResp.StringOf("paymentDetails.allowOvercharge")
Dim paymentDetailsExtendExpiration As String = jResp.StringOf("paymentDetails.extendExpiration")
Dim merchantMetadataMerchantReferenceId As String = jResp.StringOf("merchantMetadata.merchantReferenceId")
Dim merchantMetadataMerchantStoreName As String = jResp.StringOf("merchantMetadata.merchantStoreName")
Dim merchantMetadataNoteToBuyer As String = jResp.StringOf("merchantMetadata.noteToBuyer")
Dim merchantMetadataCustomInformation As String = jResp.StringOf("merchantMetadata.customInformation")
Dim supplementaryData As String = jResp.StringOf("supplementaryData")
Dim buyerBuyerId As String = jResp.StringOf("buyer.buyerId")
Dim buyerName As String = jResp.StringOf("buyer.name")
Dim buyerEmail As String = jResp.StringOf("buyer.email")
Dim buyerPhoneNumber As String = jResp.StringOf("buyer.phoneNumber")
Dim buyerPrimeMembershipTypes As String = jResp.StringOf("buyer.primeMembershipTypes")
Dim billingAddressName As String = jResp.StringOf("billingAddress.name")
Dim billingAddressAddressLine1 As String = jResp.StringOf("billingAddress.addressLine1")
Dim billingAddressAddressLine2 As String = jResp.StringOf("billingAddress.addressLine2")
Dim billingAddressAddressLine3 As String = jResp.StringOf("billingAddress.addressLine3")
Dim billingAddressCity As String = jResp.StringOf("billingAddress.city")
Dim billingAddressCounty As String = jResp.StringOf("billingAddress.county")
Dim billingAddressDistrict As String = jResp.StringOf("billingAddress.district")
Dim billingAddressStateOrRegion As String = jResp.StringOf("billingAddress.stateOrRegion")
Dim billingAddressPostalCode As String = jResp.StringOf("billingAddress.postalCode")
Dim billingAddressCountryCode As String = jResp.StringOf("billingAddress.countryCode")
Dim statusDetailsState As String = jResp.StringOf("statusDetails.state")
Dim statusDetailsReasonCode As String = jResp.StringOf("statusDetails.reasonCode")
Dim statusDetailsReasonDescription As String = jResp.StringOf("statusDetails.reasonDescription")
Dim statusDetailsLastUpdatedTimestamp As String = jResp.StringOf("statusDetails.lastUpdatedTimestamp")
Dim shippingAddressName As String = jResp.StringOf("shippingAddress.name")
Dim shippingAddressAddressLine1 As String = jResp.StringOf("shippingAddress.addressLine1")
Dim shippingAddressAddressLine2 As String = jResp.StringOf("shippingAddress.addressLine2")
Dim shippingAddressAddressLine3 As String = jResp.StringOf("shippingAddress.addressLine3")
Dim shippingAddressCity As String = jResp.StringOf("shippingAddress.city")
Dim shippingAddressCounty As String = jResp.StringOf("shippingAddress.county")
Dim shippingAddressDistrict As String = jResp.StringOf("shippingAddress.district")
Dim shippingAddressStateOrRegion As String = jResp.StringOf("shippingAddress.stateOrRegion")
Dim shippingAddressPostalCode As String = jResp.StringOf("shippingAddress.postalCode")
Dim shippingAddressCountryCode As String = jResp.StringOf("shippingAddress.countryCode")
Dim shippingAddressPhoneNumber As String = jResp.StringOf("shippingAddress.phoneNumber")
Dim platformId As String = jResp.StringOf("platformId")
Dim chargePermissionId As String = jResp.StringOf("chargePermissionId")
Dim chargeId As String = jResp.StringOf("chargeId")
Dim creationTimestamp As String = jResp.StringOf("creationTimestamp")
Dim expirationTimestamp As String = jResp.StringOf("expirationTimestamp")
Dim storeId As String = jResp.StringOf("storeId")
Dim deliverySpecificationsAddressRestrictionsType As String = jResp.StringOf("deliverySpecifications.addressRestrictions.type")
Dim providerMetadataProviderReferenceId As String = jResp.StringOf("providerMetadata.providerReferenceId")
Dim releaseEnvironment As String = jResp.StringOf("releaseEnvironment")
Dim i As Integer = 0
Dim count_i As Integer = jResp.SizeOfArray("paymentPreferences")
While i < count_i
    jResp.I = i
    paymentDescriptor = jResp.StringOf("paymentPreferences[i].paymentDescriptor")
    i = i + 1
End While
i = 0
count_i = jResp.SizeOfArray("constraints")
While i < count_i
    jResp.I = i
    i = i + 1
End While
i = 0
count_i = jResp.SizeOfArray("deliverySpecifications.specialRestrictions")
While i < count_i
    jResp.I = i
    strVal = jResp.StringOf("deliverySpecifications.specialRestrictions[i]")
    i = i + 1
End While
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
End While
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
End While
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
End While
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
End While