(PureBasic) 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 PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkHttpResponse.pb"
IncludeFile "CkHttp.pb"
IncludeFile "CkStringBuilder.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkPrivateKey.pb"

Procedure ChilkatExample()

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

    http.i = CkHttp::ckCreate()
    If http.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success.i

    ; 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.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckUpdateString(json,"chargeAmount.amount","14.00")
    CkJsonObject::ckUpdateString(json,"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.i = CkPrivateKey::ckCreate()
    If privKey.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkPrivateKey::ckLoadPemFile(privKey,"C:/someDir/myAmazonPayPrivateKey.pem")
    If success = 0
        Debug CkPrivateKey::ckLastErrorText(privKey)
        CkHttp::ckDispose(http)
        CkJsonObject::ckDispose(json)
        CkPrivateKey::ckDispose(privKey)
        ProcedureReturn
    EndIf

    ; 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.s = "SANDBOX-AHEGSJCM3L2S637RBGABLAFW"
    success = CkHttp::ckSetAuthPrivateKey(http,publicKeyId,privKey)
    If success = 0
        Debug CkHttp::ckLastErrorText(http)
        CkHttp::ckDispose(http)
        CkJsonObject::ckDispose(json)
        CkPrivateKey::ckDispose(privKey)
        ProcedureReturn
    EndIf

    ; 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

    CkHttp::setCkAccept(http, "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 = CkHttp::ckSetUrlVar(http,"sessionId","62b7d028-6c7c-4a43-b077-3897dff27c5b")
    resp.i = CkHttp::ckPostJson3(http,"https://pay-api.amazon.eu/sandbox/v2/checkoutSessions/{$sessionId}/complete","application/json",json)
    If CkHttp::ckLastMethodSuccess(http) = 0
        Debug CkHttp::ckLastErrorText(http)
        CkHttp::ckDispose(http)
        CkJsonObject::ckDispose(json)
        CkPrivateKey::ckDispose(privKey)
        ProcedureReturn
    EndIf

    sbResponseBody.i = CkStringBuilder::ckCreate()
    If sbResponseBody.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkHttpResponse::ckGetBodySb(resp,sbResponseBody)
    jResp.i = CkJsonObject::ckCreate()
    If jResp.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckLoadSb(jResp,sbResponseBody)
    CkJsonObject::setCkEmitCompact(jResp, 0)

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

    respStatusCode.i = CkHttpResponse::ckStatusCode(resp)
    Debug "Response Status Code = " + Str(respStatusCode)
    If respStatusCode <> 200

        ; 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"
        ; 	}

        Debug "Failed."
        CkHttpResponse::ckDispose(resp)

        CkHttp::ckDispose(http)
        CkJsonObject::ckDispose(json)
        CkPrivateKey::ckDispose(privKey)
        CkStringBuilder::ckDispose(sbResponseBody)
        CkJsonObject::ckDispose(jResp)
        ProcedureReturn
    EndIf

    CkHttpResponse::ckDispose(resp)

    ; 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

    nullVal.i

    checkoutSessionId.s = CkJsonObject::ckStringOf(jResp,"checkoutSessionId")
    webCheckoutDetails.s = CkJsonObject::ckStringOf(jResp,"webCheckoutDetails")
    chargePermissionType.s = CkJsonObject::ckStringOf(jResp,"chargePermissionType")
    recurringMetadata.s = CkJsonObject::ckStringOf(jResp,"recurringMetadata")
    productType.s = CkJsonObject::ckStringOf(jResp,"productType")
    paymentDetails.s = CkJsonObject::ckStringOf(jResp,"paymentDetails")
    merchantMetadata.s = CkJsonObject::ckStringOf(jResp,"merchantMetadata")
    supplementaryData.s = CkJsonObject::ckStringOf(jResp,"supplementaryData")
    buyer.s = CkJsonObject::ckStringOf(jResp,"buyer")
    billingAddress.s = CkJsonObject::ckStringOf(jResp,"billingAddress")
    statusDetailsState.s = CkJsonObject::ckStringOf(jResp,"statusDetails.state")
    statusDetailsReasonCode.s = CkJsonObject::ckStringOf(jResp,"statusDetails.reasonCode")
    statusDetailsReasonDescription.s = CkJsonObject::ckStringOf(jResp,"statusDetails.reasonDescription")
    statusDetailsLastUpdatedTimestamp.s = CkJsonObject::ckStringOf(jResp,"statusDetails.lastUpdatedTimestamp")
    shippingAddress.s = CkJsonObject::ckStringOf(jResp,"shippingAddress")
    platformId.s = CkJsonObject::ckStringOf(jResp,"platformId")
    chargePermissionId.s = CkJsonObject::ckStringOf(jResp,"chargePermissionId")
    chargeId.s = CkJsonObject::ckStringOf(jResp,"chargeId")
    creationTimestamp.s = CkJsonObject::ckStringOf(jResp,"creationTimestamp")
    expirationTimestamp.s = CkJsonObject::ckStringOf(jResp,"expirationTimestamp")
    storeId.s = CkJsonObject::ckStringOf(jResp,"storeId")
    deliverySpecifications.s = CkJsonObject::ckStringOf(jResp,"deliverySpecifications")
    providerMetadata.s = CkJsonObject::ckStringOf(jResp,"providerMetadata")
    releaseEnvironment.s = CkJsonObject::ckStringOf(jResp,"releaseEnvironment")
    i.i = 0
    count_i.i = CkJsonObject::ckSizeOfArray(jResp,"paymentPreferences")
    While i < count_i
        CkJsonObject::setCkI(jResp, i)
        nullVal = CkJsonObject::ckIsNullOf(jResp,"paymentPreferences[i]")
        i = i + 1
    Wend
    i = 0
    count_i = CkJsonObject::ckSizeOfArray(jResp,"constraints")
    While i < count_i
        CkJsonObject::setCkI(jResp, i)
        nullVal = CkJsonObject::ckIsNullOf(jResp,"constraints[i]")
        i = i + 1
    Wend


    CkHttp::ckDispose(http)
    CkJsonObject::ckDispose(json)
    CkPrivateKey::ckDispose(privKey)
    CkStringBuilder::ckDispose(sbResponseBody)
    CkJsonObject::ckDispose(jResp)


    ProcedureReturn
EndProcedure