Add ISP Support to Your Skill Code

When you implement In-Skill Purchasing (ISP) in your skill, you must do the following:

• Call the in-skill product service to get the product inventory
• Provide custom intents to enable purchases and handlers for those intents in your skill code
• Send directives from your skill code to the purchase flow specifying a product for purchase
• Resume your skill after the purchase flow completes
• For consumable purchases, save the user's inventory of items in persistent storage and manage the inventory as the user uses the items

This topic provides the steps, code examples, best practices and links to more information.

• Prerequisites
• Get the in-skill products list
• Add support for purchase requests
  • Build the intent
  • Handle the intent
    • The user doesn't specify a product
    • The user specifies a product
• Offer purchase suggestions
  • Send a directive to start the purchase suggestion
• Resume your skill after the purchase flow
  • ACCEPTED result
  • DECLINED result
  • ERROR result
  • ALREADY_PURCHASED result
• Handle a refund or cancel request
  • Build the intent
  • Handle the intent
• Manage the inventory for consumable purchases
  • Get the total purchases for a consumable product
  • Validate the inventory on every request
  • Maintain the user inventory if the user disables and re-enables the skill
• Sample code
• Related topics

Prerequisites

To complete the steps in this document you should have:

• A skill with a custom interaction model, and associated Lambda function. For details, see Steps to Build a Custom Skill. Note that you can add in-skill products to skills hosted as web services, but the code in this topic demonstrates how to add in-skill products to an AWS Lambda function.
• A skill with at least one product added to your custom skill. You can configure these products in the developer console) or with the ASK CLI.
• Designed your in-skill purchasing customer experience. For details, see Design a Good Customer Experience for In-Skill Purchasing.

Get the in-skill products list

To offer products in your skill, you will get the inventory of products available to the user in the current skill session. When you get the list, use it to:

• Know the product ID for each product. You will map user requests for products to product IDs
• Know what products are offered for sale to this user (PURCHASABLE)
• Know what this user has already purchased (products marked ENTITLED)
• For consumable products, know the number of units of the product this user has purchased as of today (activeEntitlementCount)

You get the list with a HTTP GET request to the InSkillProducts API of the in-skill product service. Add this call to your launch request handler, and store this list of products during the skill session. If the request is successful, the message result will contain an InSkillProducts object that contains a list of InSkillProduct objects.

Example

• Node.js SDK v2
• Node.js SDK v1

/*
    Function to demonstrate how to filter inSkillProduct list to get list of
    all entitled products to render Skill CX accordingly
*/
function getAllEntitledProducts(inSkillProductList) {
  const entitledProductList = inSkillProductList.filter(record => record.entitled === 'ENTITLED');
  return entitledProductList;
}

/*
    Helper function that returns a speakable list of product names from a list of
    entitled products.
*/
function getSpeakableListOfProducts(entitleProductsList) {
  const productNameList = entitleProductsList.map(item => item.name);
  let productListSpeech = productNameList.join(', '); // Generate a single string with comma separated product names
  productListSpeech = productListSpeech.replace(/_([^_]*)$/, 'and $1'); // Replace last comma with an 'and '
  return productListSpeech;
}

/*
  Request handler. This handler is used when the user starts the skill without
  specifying a specific intent.
*/
const LaunchRequestHandler = {
  canHandle(handlerInput) {
    return handlerInput.requestEnvelope.request.type === 'LaunchRequest';
  },
  handle(handlerInput) {

    const locale = handlerInput.requestEnvelope.request.locale;
    const ms = handlerInput.serviceClientFactory.getMonetizationServiceClient();

    return ms.getInSkillProducts(locale).then(
      function reportPurchasedProducts(result) {
        const entitledProducts = getAllEntitledProducts(result.inSkillProducts);
        if (entitledProducts && entitledProducts.length > 0) {
          // Customer owns one or more products

          return handlerInput.responseBuilder
            .speak(`Welcome to ${skillName}. You currently own ${getSpeakableListOfProducts(entitledProducts)}` +
              ' products. To hear a random fact, you could say, \'Tell me a fact\' or you can ask' +
              ' for a specific category you have purchased, for example, say \'Tell me a science fact\'. ' +
              ' To know what else you can buy, say, \'What can i buy?\'. So, what can I help you' +
              ' with?')
            .reprompt('I didn\'t catch that. What can I help you with?')
            .getResponse();
        }

        // Not entitled to anything yet.
        console.log('No entitledProducts');
        return handlerInput.responseBuilder
          .speak(`Welcome to ${skillName}. To hear a random fact you can say 'Tell me a fact',` +
            ' or to hear about the premium categories for purchase, say \'What can I buy\'. ' +
            ' For help, say , \'Help me\'... So, What can I help you with?')
          .reprompt('I didn\'t catch that. What can I help you with?')
          .getResponse();
      },
      function reportPurchasedProductsError(err) {
        console.log(`Error calling InSkillProducts API: ${err}`);

        return handlerInput.responseBuilder
          .speak('Something went wrong in loading your purchase history')
          .getResponse();
      },
    );
  },
}; // End LaunchRequestHandler   

function onLaunch(launchRequest, session, callback) {
    console.log(`onLaunch requestId=${launchRequest.requestId}, sessionId=${session.sessionId}`);
    ...
    // call a function to get the available products
    getProductsAndEntitlements(this, functionToProcessProductListOnceItIsLoaded);
    ...    
}

function getProductsAndEntitlements(self, callback)   {
    // Invoke the entitlement API to load products only if not already cached
    if (!self.attributes.areProductsLoaded)    {
        self.attributes.inSkillProducts = [];
        var returnData = [];

        // Information required to invoke the API is available in the session
        const https = require('https');
        const apiEndpoint = "api.amazonalexa.com";
        const token  = "bearer " + self.event.context.System.apiAccessToken;
        const language    = self.event.request.locale;

        // The API path
        const apiPath     = "/v1/users/~current/skills/~current/inSkillProducts";

        const options = {
            host: apiEndpoint,
            path: apiPath,
            method: 'GET',
            headers: {
                "Content-Type"      : 'application/json',
                "Accept-Language"   : language,
                "Authorization"     : token
            }
        };

        // Call the API
            const req = https.get(options, (res) => {
            res.setEncoding("utf8");

            if(res.statusCode != 200)   {
                console.log("InSkillProducts returned status code " + res.statusCode);
                self.emit(":tell", "Something went wrong in loading the purchase history. Error code " + res.code );
            }

            res.on('data', (chunk) => {
                console.log("Chunk:" + chunk);
                    returnData += chunk;
            });

            res.on('end', () => {
                var inSkillProductInfo = JSON.parse(returnData);
                if(Array.isArray(inSkillProductInfo.inSkillProducts))  
                    self.attributes.InSkillProducts = inSkillProductInfo.inSkillProducts;
                else
                    self.attributes.InSkillProducts=[];

                console.log("Product list loaded:" + JSON.stringify(self.attributes.InSkillProducts));
                callback(self, self.attributes.InSkillProducts);
            });   
        });

        req.on('error', (e) => {
            console.log('Error calling InSkillProducts API: ' + e.message);
            self.emit(":tell", "Something went wrong in loading the product list. Error code " + e.code + ", message is " + e.message);
        });

    } // End if (!self.attributes.areProductsLoaded) {}
    else    {
        console.log("Product info already loaded.");
        callback(self, self.attributes.InSkillProducts);
        return;
    }
}

// Process the product list.
var functionToProcessProductListOnceItIsLoaded = function(self, inSkillProductList)  {
    if (!inSkillProductList)    {
        console.log("Something went wrong in loading product list.");
    }
    // Do something with the retrieved product list
    for (var idx = 0; idx < inSkillProductList.length; idx ++)   {
        console.log("inSkillProductList[" + idx + "] is:" + JSON.stringify(inSkillProductList[idx]));
    }
}

Add support for purchase requests

You will add support for a user to shop products and buy one by name in your skill. For example, you would want to support requests like the following:

• What can I buy?
• What can I shop for?
• Tell me what I can buy
• I want to buy product name
• I want product name
• Alexa, ask skill invocation name to give me product name

To support purchase requests, you:

• Build a custom intent to support a purchase request
• Add code to handle the custom intent, and start a purchase flow by sending a directive

Build the intent

The following JSON is an example of how you could model custom intents to support a user request to buy a product by name, or to find products to buy.

Example

{
  "intents": [
    {
      "name": "WhatCanIBuyIntent",
      "samples": [
        "what can I buy",
        "what can I shop for",
        "tell me what I can buy",
        "buy",
        "shop",
        "purchase"        
      ],
      "slots": []
    },    
    {
      "name": "BuyIntent",
      "samples": [
        "buy {ProductName}",
        "purchase {ProductName}",
        "want {ProductName}",
        "would like {ProductName}"
      ],
      "slots": [
        {
          "name": "ProductName",
          "type": "LIST_OF_PRODUCT_NAMES"
        }
      ]
    }    
  ],
  "types": [
    {
      "name": "LIST_OF_PRODUCT_NAMES",
      "values": [
        {
          "id": "reference_name",
          "name": {
            "value": "Product A",
            "synonyms": [
              "A product"
            ]
          }
        }
      ]
    }
  ]
}

Handle the intent

When you handle the buy intent, there are two scenarios your code must handle.

• The user doesn't specify a product
• The user specifies a product

The user doesn't specify a product

The user may ask to shop the products you offer. In this case, you should direct the user to specify one product. In other words, your code detects a generic shop or buy request and responds to the user with a list of eligible products to choose from. When you give a list:

• Make options easier to remember by listing only 2 or 3 at a time
• Use periods or break SSML tags instead of commas to clearly distinguish one option from another. For more information, see the Lists section of the design guide
  

For example:

User: What can I buy?
Alexa: I have 2 expansion packs available. Cave Quest or Deep Sea. Which are you interested in?

The user specifies a product

The user might specify a product directly, or you might direct them to choose a product. Regardless, after the user specifies the product to buy, you start the purchase flow by sending a Buy directive.

Your skill session ends when the purchase flow starts. Amazon handles the voice interaction model and all the mechanics of the purchase, as well as obtaining the product description and list price from the product's schema. The message and price are automatically adjusted for Prime customers. When the purchase completes, your skill re-launches with a new session and with a purchase result supplied to your skill.

Example

The following example shows how you might add code to a Lambda function to send the Connections.SendRequest directive for a buy request.

• Node.js SDK v2
• Node.js SDK v1
• Raw JSON

return handlerInput.responseBuilder
        .addDirective({
            type: "Connections.SendRequest",
            name: "Buy",
            payload: {
                InSkillProduct: {
                    productId: "amzn1.adg.product.aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
                }
            },
            token: "correlationToken"
        })
        .getResponse();

this.handler.response = {
  'version': '1.0',
  'response': {
      'directives': [
          {
              'type': 'Connections.SendRequest',
              'name': 'Buy',          
              'payload': {
                         'InSkillProduct': {
                             'productId': 'amzn1.adg.product.aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee'                       
                         }
               },
              'token': 'correlationToken'              
          }
      ],
      'shouldEndSession': true
  }
};

this.emit(":responseReady");

{
  "directives": [
    {
      "type": "Connections.SendRequest",
      "name": "Buy",
      "payload": {
        "InSkillProduct": {
          "productId": "amzn1.adg.product.aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"
        }
      },
      "token": "correlationToken"
    }
  ]
}

Directive fields

Offer purchase suggestions

Another way for users to buy your in-skill products is with a purchase suggestion, which means you proactively offer products related to how the user is currently interacting with your skill. You would check whether a user owns a product from the saved list and pass the product you want to suggest as well as a message relevant to that product to Amazon's purchase flow. To offer purchase suggestions, you:

• Add code that starts the purchase flow with a directive.

For example:

Send a directive to start the purchase suggestion

When you want to respond to a user intent with a purchase suggestion, you send a Connections.SendRequest directive to Alexa that:

• Indicates a purchase suggestion by specifying upsell
• Provides the identifier for the suggested product
• Provides a message prompt for the purchase suggestion, the upsellMessage
• Contains a token to store the current state of the skill or other relevant information. This is passed back to your skill in the response from the SendRequest call.
  

For the upsellMessage:

• Never include price or offer details. Be careful not to reference the list price, subscription term, or free trial length in any of the skill content. It is important that these values are obtained from your product description files. For example, Amazon may offer a discounted price if the user is a Prime member.
• Determine whether a user is interested by making sure the message ends with an explicit confirmation question. Also do not ask whether they'd like to buy. Users make a buying decision after this step.
• Help, don't sell. Offer your product as a solution. Explain why your product is relevant at this moment, and what it does for the user.
• Avoid suggesting products too often. You risk losing users when your suggestions begin to feel like interruptions. Start conservatively, than change the frequency over time to find the best approach.
• Only make one suggestion. If a user isn't interested, continue where they left off. Don't suggest another product.

For more information about how to offer purchase suggestions, see How to Make a Purchase Suggestion.

Your skill session ends when the purchase flow starts. Amazon handles the voice interaction model and all the mechanics of the purchase, as well as obtaining the product description and list price from the product's schema. The message and price are automatically adjusted for Prime customers. When the purchase completes your skill will be re-launched, and a purchase result is supplied to your skill.

Example

The following example shows how you might add code to a Lambda function to send the Connections.SendRequest directive for a purchase suggestion.

• Node.js SDK v2
• Node.js SDK v1
• Raw JSON

return handlerInput.responseBuilder
        .addDirective({
            type: "Connections.SendRequest",
            name: "Upsell",
            payload: {
                InSkillProduct: {
                    productId: "amzn1.adg.product.aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
                },
                upsellMessage: "This is my product...Do you want to know more?",
            },
            token: "correlationToken",
        })
        .getResponse();

this.handler.response = {
  'version': '1.0',
  'response': {
      'directives': [
          {
              'type': 'Connections.SendRequest',
              'name': 'Upsell',         
              'payload': {
                         'InSkillProduct': {
                            'amzn1.adg.product.aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee'                          
                         },
                        'upsellMessage': 'This is my product...Do you want to know more?'
               },
              'token': 'correlationToken'   
          }
      ],
      'shouldEndSession': true
  }
};

this.emit(":responseReady");

{
  "directives": [
    {
      "type": "Connections.SendRequest",
      "name": "Upsell",
      "payload": {
        "InSkillProduct": {
          "productId": "amzn1.adg.product.aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"
        },
        "upsellMessage": "This is my product...Do you want to know more?"
      },
      "token": "correlationToken"
    }
  ]
}

Directive Fields

Resume your skill after the purchase flow

You need to correctly handle the result of a purchase flow and resume your skill so the user experience is smooth.

To do this:

• You handle the Connections.Response request

The result of the purchase flow is a Connections.Response request that indicates whether the purchase was successful, and the token passed in the request, which you can use to help you resume where the user left off.

Use the guidelines in the sections that follow for details about how to handle each result type.

Example

The following JSON shows a Connections.Response request from a product offer.

{
    "type": "Connections.Response",
    "requestId": "string",
    "timestamp": "string",
    "name": "Upsell",
    "status": {
        "code": "string",
        "message": "string"  
    },
    "payload": {
        "purchaseResult":"ACCEPTED",    
        "productId":"string",   
        "message":"optional additional message"
    },
    "token": "string"
}

Connection.Response Request Fields

You should check the status of the product returned in the purchaseResult using the InSkillProduct API, and use the following guidelines to handle the purchaseResult.

ACCEPTED result

What Alexa says:

• One time purchase or consumable: "Great! You have successfully purchased in-skill product name"
• Subscription: "Great. You now have in-skill product name"

What your skill should do:

Automatically start requested content or use the requested consumable, for example, "Let's play it now…" or "Here's your hint…" If the user commits to a purchase, make sure you complete their original request.

For a consumable product, your skill also needs to update the user's inventory of items in persistent storage associated with the userId provided in the request. See Manage the inventory for consumable purchases.

Example:

DECLINED result

What Alexa says:

• One time purchase or consumable: "Okay"
• Subscription: "No problem. You can ask me to sign up for in-skill product name anytime."

What your skill should do:

Pick up where the user left off and offer a way for the user to continue.

Example:

ERROR result

What Alexa says:

The response depends on why the error occurred.

• "Hmm, I had a problem with your payment method. To update, checkout the link I sent to your Alexa app."
• "Sorry, I'm having trouble with that right now."
• "I'm sorry. content title isn't available in your country."
• "Sorry, I'm not able to make in-skill purchases on this device."

What your skill should do:

• Pick up where the user left off, offer a way for them to continue.
• Avoid mentioning that an error occurred. The user receives an explanation from the purchase flow before they return to your skill.
• Do not ask the user if they'd like to try again.

Example:

ALREADY_PURCHASED result

This result can be returned for one-time purchases and subscriptions.

This result is never returned for consumables since consumable products can be purchased multiple times.

What Alexa says:

Good news, you already have in-skill product name

What your skill should do:

• Automatically start the requested content.
• Do not offer a different product

Example:

Handle a refund or cancel request

You must also be able to handle a user request to refund a purchase and forward the request to the purchase flow.

A user might ask for a refund in one of the following ways:

• Alexa, tell skill invocation name to return product name
• Alexa, refund product name
• I want to return product name
• I want a refund for product name

Example:

Or a user might ask to cancel a subscription in one of the following ways:

• Cancel my subscription for product name
• Cancel the subscription for product name

Example:

To support cancellation or refund requests, you:

• Build a custom intent to support a refund/cancellation request
• Add code to handle the custom intent, and start a cancellation flow by sending a directive

Build the intent

The following JSON is an example of how you could model the custom intent to support a user request to refund a purchase. The sample intent lists variants to return or refund a product, and a custom slot that contains a list of the in-skill products.

Example

{
  "intents": [
    {
      "name": "RefundSkillItemIntent",
      "samples": [
        "return {ProductName}",
        "refund {ProductName}",
        "want a refund for {ProductName}",
        "would like to return {ProductName}"
      ],
      "slots": [
        {
          "name": "ProductName",
          "type": "LIST_OF_PRODUCT_NAMES"
        }
      ]
    }
  ],
  "types": [
    {
      "name": "LIST_OF_PRODUCT_NAMES",
      "values": [
        {
          "id": "reference_name",
          "name": {
            "value": "Product A",
            "synonyms": [
              "A product"
            ]
          }
        }
      ]
    }
  ]
}

Handle the intent

In your handler for the refund/cancel intent, you should send a message to the purchase flow that indicates a cancellation.

The following example shows how you might add code to send a Connections.SendRequest directive for a refund request.

• Node.js SDK v2
• Node.js SDK v1
• Raw JSON

return handlerInput.responseBuilder
        .addDirective({
            type: 'Connections.SendRequest',
            name: 'Cancel',
            payload: {
                InSkillProduct: {
                    productId: "amzn1.adg.product.aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
                }
            },
            token: "correlationToken"
        })
        .getResponse();

this.handler.response = {
  'version': '1.0',
  'response': {
      'directives': [
          {
              'type': 'Connections.SendRequest',
              'name': 'Cancel',            
              'payload': {
                         'InSkillProduct': {
                             'productId': 'amzn1.adg.product.aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee'
                         }
               },
             'token': 'correlationToken'              
          }
      ],
      'shouldEndSession': true
  }
};

this.emit(":responseReady");

{
  "directives": [
    {
      "type": "Connections.SendRequest",
      "name": "Cancel",
      "payload": {
        "InSkillProduct": {
          "productId": "amzn1.adg.product.aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"
        }
      },
      "token": "correlationToken"
    }
  ]
}

Directive fields

Manage the inventory for consumable purchases

If you offer consumable products, you need to maintain the user's inventory of items as they purchase and use the items. Alexa keeps track of the total number times the user purchased a particular product, but this does not reflect the user's consumption of the purchased units. When your skill gets an ACCEPTED response for a consumable purchase, you need to:

• Update the user's inventory in persistent storage to reflect the correct number of items. For instance, add five items if the user bought a "five hint pack".
• Use the item if appropriate and decrement the inventory.
• Save the inventory updates in persistent storage.

The ASK SDKs for Node.js, Java, and Python all include a PersistenceAdapter to save attributes. For details, see ASK SDK documentation about persistent attributes.

When storing the user's inventory in persistent storage, always map the inventory to the userId included in the request. The userId is always provided in the context object in the request (context.System.User.userId). The default persistence layer provided in the SDKs uses userId automatically.

For a sample skill that offers consumables and manages the inventory, see Name the Show.

Get the total purchases for a consumable product

To get the total number of times a user has purchased a particular consumable product, you can call the InSkillProducts API, then check the activeEntitlementCount property. The value for activeEntitlementCount reflects the total purchases the user has made. Each purchase of the product increments activeEntitlementCount by one. Each cancellation (such as due to a payment failure or refund request) decrements activeEntitlementCount by one.

Note that total purchases may not correspond to the number items the user can use in your skill if you offer multi-item packs. For example, your skill offers a "five hint pack" for sale. A user purchases this pack three times. With each purchase, you increment their inventory by five. In this case:

• The activeEntitlementCount returned from the InSkillProducts API is 3
• The inventory you maintain for the user contains 15

The user then uses 14 of the 15 hints. At this point:

• The activeEntitlementCount returned from the InSkillProducts API is still 3
• The inventory you maintain for the user contains 1

Validate the inventory on every request

It is possible for the user's number of entitled consumable purchases to change outside of a normal skill session. For example:

• The user requested a refund for an accidental purchase. The next time the user opens your skill, activeEntitlementCount returns a smaller value than before. The user's inventory in your persistent storage reflects the user's pre-refund purchase.
• During your own testing, you use the reset-isp-entitlement to clear your own purchases and start over. The next time you open your skill, activeEntitlementCount returns 0, but your own inventory in persistent storage reflects your earlier test purchases.

To account for cases like these, check and update the inventory on every incoming request. The ASK SDKs for Node.js, Java, and Python all include request interceptors, which are a useful way to run code before your normal request handler. This can be a good way to implement this inventory check. For details, see ASK SDK documentation about request interceptors.

Maintain the user inventory if the user disables and re-enables the skill

If your skill offers consumable products, the userId remains the same even if the user disables and re-enables the skill. This ensures that the inventory of items that you maintain isn't lost in this scenario.

You don't need to do anything to get this special userId behavior in this scenario. However, if you use the AlexaSkillEvent.SkillDisabled event to perform any cleanup after a user disables your skill, be sure to retain the user's consumable purchase inventory. You can check the userInformationPersistenceStatus property in the event object:

• PERSISTED: If the user re-enables the skill, they will get the same userId, so do not clear their data.
• NOT_PERSISTED: If the user re-enables the skill, they will get a new userId. Therefore, it is safe to clear data you have stored with the userId.

Sample code

• Name the Show – A sample skill that demonstrates selling consumable items by selling the user hints for a trivia game. Available in Node.js.

• Premium fact skill – A sample skill that demonstrates how to use the in-skill purchase features of Alexa skills by offering different packs of facts behind a purchase, and a subscription to unlock all of the packs at once. Available in Node.js and Python:

  • Node.js: skill-sample-nodejs-fact-in-skill-purchases
  • Python: skill-sample-python-fact-in-skill-purchases
• Premium "Hello World" skill – A sample skill that demonstrates how to use ISP features by offering a "Greetings Pack" and a "Premium Subscription". Available in Node.js and Java:
  • Node.js: skill-sample-nodejs-premium-hello-world
  • Java: skill-sample-java-premium-hello-world

Related topics

• Make Money with Alexa Skills: Adding In-Skill Purchasing
• Code Deep Dive: Implementing In-Skill Purchasing for Subscriptions with Node.js
• Testing Guide
• Certification Guide