(Go) 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.

    http := chilkat.NewHttp()
    var success bool

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

    json := chilkat.NewJsonObject()
    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")
    i := 0
    json.SetI(i)
    json.UpdateString("scopes[i]","name")
    i = i + 1
    json.SetI(i)
    json.UpdateString("scopes[i]","email")
    i = i + 1
    json.SetI(i)
    json.UpdateString("scopes[i]","phoneNumber")
    i = i + 1
    json.SetI(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.
    privKey := chilkat.NewPrivateKey()
    success = privKey.LoadPemFile("C:/someDir/myAmazonPayPrivateKey.pem")
    if success == false {
        fmt.Println(privKey.LastErrorText())
        http.DisposeHttp()
        json.DisposeJsonObject()
        privKey.DisposePrivateKey()
        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
    publicKeyId := "SANDBOX-AHEGSJCM3L2S637RBGABLAFW"
    success = http.SetAuthPrivateKey(publicKeyId,privKey)
    if success == false {
        fmt.Println(http.LastErrorText())
        http.DisposeHttp()
        json.DisposeJsonObject()
        privKey.DisposePrivateKey()
        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.SetAccept("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
    resp := http.PostJson3("https://pay-api.amazon.eu/sandbox/v2/checkoutSessions/","application/json",json)
    if http.LastMethodSuccess() == false {
        fmt.Println(http.LastErrorText())
        http.DisposeHttp()
        json.DisposeJsonObject()
        privKey.DisposePrivateKey()
        return
    }

    sbResponseBody := chilkat.NewStringBuilder()
    resp.GetBodySb(sbResponseBody)
    jResp := chilkat.NewJsonObject()
    jResp.LoadSb(sbResponseBody)
    jResp.SetEmitCompact(false)

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

    respStatusCode := resp.StatusCode()
    fmt.Println("Response Status Code = ", 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."
        // 	}

        fmt.Println("Failed.")
        resp.DisposeHttpResponse()
        http.DisposeHttp()
        json.DisposeJsonObject()
        privKey.DisposePrivateKey()
        sbResponseBody.DisposeStringBuilder()
        jResp.DisposeJsonObject()
        return
    }

    resp.DisposeHttpResponse()

    // 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

    var nullVal bool
    var constraintId *string = new(string)
    var description *string = new(string)
    var strVal *string = new(string)

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

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

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

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

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

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

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


    http.DisposeHttp()
    json.DisposeJsonObject()
    privKey.DisposePrivateKey()
    sbResponseBody.DisposeStringBuilder()
    jResp.DisposeJsonObject()