B4X
Amazon Pay - Complete Checkout Session

Complete Checkout Session after the buyer returns to checkoutResultReturnUrl to finalize the paymentIntent.
Chilkat B4X Downloads

B4X
Dim success As Boolean = False

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

Dim http As ChilkatHttp
http.Initialize("http")

'  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"
'    }
'  }

Dim json As ChilkatJsonObject
json.Initialize
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.
Dim privKey As ChilkatPrivateKey
privKey.Initialize("privKey")
success = privKey.LoadPemFile("C:/someDir/myAmazonPayPrivateKey.pem")
If success = False Then
    Log(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 = "SANDBOX-AHEGSJCM3L2S637RBGABLAFW"
success = http.SetAuthPrivateKey(publicKeyId, privKey)
If success = False Then
    Log(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 HttpJson.
'  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")
Dim resp As ChilkatHttpResponse
resp.Initialize
success = http.HttpJson("POST", "https://pay-api.amazon.eu/sandbox/v2/checkoutSessions/{$sessionId}/complete", json, "application/json", resp)
If success = False Then
    Log(http.LastErrorText)
    Return
End If


Dim sbResponseBody As ChilkatStringBuilder
sbResponseBody.Initialize
resp.GetBodySb(sbResponseBody)
Dim jResp As ChilkatJsonObject
jResp.Initialize
jResp.LoadSb(sbResponseBody)
jResp.EmitCompact = False

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

Dim respStatusCode As Int = resp.StatusCode
Log("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'"
    '  	}

    '  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"
    '  	}

    Log("Failed.")
    Return
End If


'  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



Dim nullVal As Boolean

Dim checkoutSessionId As String = jResp.StringOf("checkoutSessionId")
Dim webCheckoutDetails As String = jResp.StringOf("webCheckoutDetails")
Dim chargePermissionType As String = jResp.StringOf("chargePermissionType")
Dim recurringMetadata As String = jResp.StringOf("recurringMetadata")
Dim productType As String = jResp.StringOf("productType")
Dim paymentDetails As String = jResp.StringOf("paymentDetails")
Dim merchantMetadata As String = jResp.StringOf("merchantMetadata")
Dim supplementaryData As String = jResp.StringOf("supplementaryData")
Dim buyer As String = jResp.StringOf("buyer")
Dim billingAddress As String = jResp.StringOf("billingAddress")
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 shippingAddress As String = jResp.StringOf("shippingAddress")
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 deliverySpecifications As String = jResp.StringOf("deliverySpecifications")
Dim providerMetadata As String = jResp.StringOf("providerMetadata")
Dim releaseEnvironment As String = jResp.StringOf("releaseEnvironment")
Dim i As Int = 0
Dim count_i As Int = jResp.SizeOfArray("paymentPreferences")
Do While i < count_i
    jResp.I = i
    nullVal = jResp.IsNullOf("paymentPreferences[i]")
    i = i + 1
Loop
i = 0
count_i = jResp.SizeOfArray("constraints")
Do While i < count_i
    jResp.I = i
    nullVal = jResp.IsNullOf("constraints[i]")
    i = i + 1
Loop