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Bixby Developer Center


Simple One-Step Transactional Capsule

About This Capsule

This sample capsule uses transactional features to create a simple, one-step method for transferring money.

The capsule contains three actions types to help the user find an account (Search), start a transfer (BeginTransaction), and complete a transfer (Commit).

Here are a few training entries that are included with the capsule:

  • "Transfer $10": Annotation for prefix symbol and currency value.
  • "Transfer $1000 from my checking account to my savings accounts": Annotations for prefix symbol, currency value, and account type.
  • "Transfer from my Money Market account": Adds a continuation using account type.

Along with training, the capsule includes vocabulary for account types. This capsule also includes custom layouts to display information such as account summary, transfer details, transfer confirmation, and receipt details, as well as custom input views for user input.

Download this Capsule

Files Included in the Sample Capsule

The following folders and files are included in the sample capsule. More information about what these files do and how they interact with each other are explained further in the walkthrough.

  • README.md - File that includes the latest updates to the sample capsule files.
  • capsule.bxb - File that contains the metadata Bixby needs to interpret capsule contents.
  • code - Folder of JavaScript files that actually execute the search and transactions modeled in the actions.
  • models - Folder holding the different model types: actions and concepts.
  • resources - Folder of resources.
    • base - Base resources used in all targets.
      • dialog - Folder of Dialog files that determine what Bixby tells the user.
      • layout - Folder of Layout files that help determine what the user sees.
      • transactions - Folder containing transaction files, namely the main precommit.transaction.bxb file that defines the transactional features.
      • views - Folder of Views files that help determine the user experience per each moment during the conversation.
        • input - Folder of input-view files that allow users to input responses.
    • en-US - Folder containing files for the US-English locale.
      • training - Folder of training files that help Bixby learn to generalize within this capsule. You do not edit these files directly but interact with training via Bixby Developer Studio.
      • vocab - Folder of Vocabulary files that helps Bixby recognize different account transaction terms.
      • capsule.properties - File containing configuration information for your capsule.
      • endpoints.bxb - File that specifies which JavaScript functions map to each action models.
      • nlg-strings.dialog.bxb and ui-strings.dialog.bxb - Dialog template-macro-def files that contain reusable strings for the transaction and UI.

Sample Capsule Goals

The example.bank sample capsule and this guide highlights and explains the implementation of the following platform features:

Sample Capsule Walkthrough

This capsule demonstrates how users can transfer funds between their own accounts. If users don't include one of the required inputs in their query, Bixby prompts for them to provide that information. Once Bixby has all the prerequisites, Bixby displays a confirmation page with editable elements, so users can make changes to the transfer. After users confirm the transfer, Bixby sends a secure request to the server to make the transfer, using OAuth. When the transfer is completed, Bixby creates and displays a receipt.

Initialization of Transaction

Users can initiate a transfer by simply saying "I need to transfer money to my savings account" or by giving all the pertinent information to Bixby, such as "Transfer $100 from my checking to my savings account for my college fund!". Since this is a transaction use-case, the goal is an action for all of these utterances. Transaction use-cases require actions namely because the user is expecting an action to be done and as such, the platform needs to make sure an action is taken.

Specifically, the goal for these utterances is the action model CreateTransfer.

CreateTransfer is an action of type BeginTransaction, which denotes to Bixby the start of a transaction. Note that this action model is not a Constructor type, even though its output is a structure concept. The BeginTransaction type indicates to the platform that this workflow is transactional. If this action, the subsequent actions, and associated structures aren't tagged appropriately, the platform can't continue the workflow.

It has three required inputs (toAccount, fromAccount, and transferAmount) and one optional input (note).

  • The toAccount and fromAccount are of type ToAccount and FromAccount, respectively.
    • Both ToAccount and FromAccount have a role-of the Account structure, meaning they are both Account types with all the same properties.
    • Account has a single property: accountType. This is the enum AccountType, which can be Checking, Savings, or MoneyMarket.
    • Both inputs have defined a default-init with an intent set to FindAccount. With default-init, if the user provides no input, Bixby will look for all available accounts and prompt the user to choose one.
  • The transferAmount property type is the TransferAmount structure.
    • TransferAmount has the role of viv.money.Currency. The example.bank capsule imports viv.money in the capsule.bxb file in order to use this structure.
  • The note is of type Text and is an optional way for the user to provide a purpose of the transfer. For example, "Transfer $1000 from my checking to my savings for my college fund!", the note is "my college fund".

The output for CreateTransfer is the structure concept Transfer. After the user initializes the transaction, Bixby needs to prepare this Transfer.

Preparing the Transfer

The planner takes the inputs from CreateTransfer during initialization and creates a Transfer structure. Note that Transfer is flagged with the transaction concept feature. Since CreateTransfer is of type BeginTransaction, its resulting output must be in the transaction state. This marks the structure as needing to be tracked throughout the transactional workflow. The corresponding precommit.transaction.bxb file defines this transaction phase for the Transfer structure. This file provides a status bar with a button for the user to select CommitTransfer in order to commit the transfer.

This Transfer structure has these properties that were determined by the provided inputs from CreateTransfer:

  • transferAmount [Required]
  • toAccount [Required]
  • fromAccount [Required]
  • note [Optional]

The planner has to ensure that there are values for all required inputs, namely by determining the transfer amount and finding accounts.

After it has the transfer properties set, Bixby creates a transfer confirmation page, letting the user update the transfer properties.

Determining Transfer Amount

If the user specifies an amount such as "Transfer $1000 from checking to savings", Bixby can process "$1000" as a transferAmount. Since the transferAmount has the role-of Money.Currency, it takes in the dollar sign ($) to figure out which currency to use, and it processes the number (1000) as the Value. Bixby then understands that it is transferring $1000. The viv.Money capsule also considers the request origin and smartly chooses the currency. In this case, because this capsule was run in the US, Bixby chose US dollars instead of Australian or Canadian dollars:

Transfer Amount Explained

If the utterance is something like "I need to transfer money to my savings account from my checking", the transferAmount is empty, and Bixby needs an input to continue. This calls the TransferAmount_Input.view.bxb file, which creates an input-view. In this case, Bixby creates a simple form where the user can specify a TransferAmount.

Form for transfer amount input

This form has a template message, asking the user How much do you want to transfer? with the HowMuch template macro. The form also has a single number-input text field. The value inputted in the number-input text field passes back to Bixby as the TransferAmount, as defined in the form's on-submit intent:

on-submit {
goal: example.bank.TransferAmount
value {
// This lets us submit the value from the
// element with the id transferAmount, which is defined below.

The number-input also has a prefix parameter to indicate the money being transferred is in dollars ($) and a label to indicate to the user that the field is for the transfer amount.

Finding Accounts

For both the toAccount and fromAccount, Bixby needs to access the bank server and find the account in question, while using OAuth. In order to implement OAuth, the capsule.properties and the endpoints.bxb files need to be set up properly.

  • capsule.properties file - Enables Bixby to reach the local server as an OAuth endpoint by default. Set the config.default.endpoint property to your endpoint URL, which you determine during from your client provider.
  • endpoints.bxb file - Sets OAuth information and enables authorization. The authorization key needs several oauth child keys to be populated. For more information on how to implement this, see OAuth Authorization With Endpoints.

    authorization {
    oauth {
    authorize-endpoint ("https://bank-oauth.appspot.com/dialog/authorize")
    client-id ("xyz123")
    client-secret ("ssh-password")
    grant-type ("authorization_code")
    provider ("Mock Bank")
    scope ("transfer_money")
    token-endpoint ("https://bank-oauth.appspot.com/oauth/token")

If users are not logged into the bank, a button with "Log in to Mock Bank 123" appears. Click on it and a separate browser window opens, which lets users log in with the given username and password on the web page. This button and the mechanics to log into the mock bank are handled by the platform automatically, if your capsule.properties and endpoints.bxb files are set up properly.

After users log in, Bixby has the authorization to find accounts, using the FindAccounts action. While it is searching, Bixby gives users a status update, telling them something like Finding accounts.... There is no dialog or template macro for this message since it is handled by the platform automatically.

The FindAccounts action is set up similarly to the Simple Search Sample Capsule. The biggest difference, however, is that in the corresponding FindAccounts JavaScript file, instead of searching a local JSON file, it makes an http.oauthGetUrl call and makes the search on the server for the accountType specified. If found, FindAccount returns the account.

Note the following about this process:

  • The same process is used to find both the toAccount and fromAccount.
  • There is no restriction on the toAccount and fromAccount being the same.
  • If users don't specify one of these accounts, the default-init value calls FindAccount and prompts the user to choose one of the accounts found. There are also appropriate dialog files created called ChooseFromAccount or ChooseToAccount, which ask the user Which account do you want to transfer to? or Which account do you want to transfer from?, that are generated.
    Account Prompt
  • Both prompts are created by respective input-view files. Both these files use a Selection Picker (selection-of) Views component to list all of the available accounts. Note that there is no account.layout.bxb file in the capsule. Bixby is using the platform-generated default Summary layout for account.

For example, if you have an utterance like "Transfer $100 to my checking account", there is no AccountType for the fromAccount. Bixby calls FindAccount, which in turn generates the TransferFrom.view.bxb file for the user to choose an account. The TransferFrom.view.bxb file creates a layout for each account in the Selection Picker, as can be seen in the debug console:

From Account Plan

Confirming the Transaction

Once Bixby prepares the transfer, it tells users Click next when you are ready to confirm transfer details. with the ClickWhenReady template macro (located in the nlg-strings.dialog.bxb file), while presenting a Confirmation page. This is because the CreateTransfer action has the confirm key declared, with the mode set to Transactional. This means Bixby requires user confirmation before the transaction can go to the commit phase of the workflow.

  confirm {
by (common.Confirmation)

Without this confirm key, the Confirmation view will not know what to match.

For this confirmation process, Bixby uses the CreateTransfer_Confirmation.view.bxb file, which customizes this CreateTransfer information and lets users update the transaction information as well as confirm the information before Bixby makes the transfer.

The CreateTransfer_Confirmation view uses several tools to create this page. First, this confirmation layout uses Bixby Views components. For this layout, it specifically uses the input-cell component for each property to display. This component formats each cell to be clickable automatically. Here's an example for the input-cell that asks the user to confirm from where they are sending money:

input-cell {
label {
template-macro (SendFromLabel)
value {
template ("#{value(this.fromAccount.accountType)}")
on-click {
intent {
subplan {
goal {FromAccount }
subplan {
goal: FindAccount
value-set { AccountType {}}
goal { @conversational CreateTransfer }

Within each input cell, there is a label, a value that needs to be confirmed, and an on-click with an intent.

The ui-strings.dialog.bxb file defines a number of template-macro-def keys, which format text both in dialog and layouts. These template-macro keys are used in all of the layout files. For example, any time Bixby wants to indicate that this is an account, AccountLabel can be invoked to add the word "Account" in front of the accountType. If at any point that you want to change that text to something like "Account Name", you would only need to change it in the template-macro-def in ui-strings.dialog.bxb.

In CreateTransfer_Confirmation, the intent elicits a prompt for the user to change the transfer property's value if clicked. For example, consider the following intent element:

intent {
subplan {
goal { ToAccount }
subplan {
goal: FindAccount
value-set { AccountType {}}
goal { @conversational CreateTransfer }

This intent block sets up a subplan to find an account and passes this information back to the main goal of CreateTransfer.


The @conversational key is deprecated. You should replace it in your code with @context (Continuation).

This is what the confirmation page looks like:

Confirmation Page

Once users are satisfied with their choices, they must click "Next" to commit and make the transfer.

Updating the Transaction

If users want to change one of the inputs (such as adding a note or changing the account), they select one of the inputs, and Bixby brings up a value prompt. For example, if users tell Bixby "Transfer $50 from my checking to my savings", but then they decide to transfer from their Money Market account instead, they would select the box that says "Send money from Checking" to change the fromAccount.

Bixby calls the TransferFrom.view.bxb file. This does two things: it asks users Which account do you want to transfer from? using the WhichFrom template macro, and it displays the selection prompt with the available accounts to choose from.

Prompt for updating account

Click one of the accounts to choose it. If the planner can find the account, it brings users back to the Confirmation Page with the updated choice.

If the user wants to edit the amount to transfer, the same TransferAmount_Input.view.bxb file is called, letting the user input a Transfer Amount, and consequently updates the Transfer structure.

If the user wants to add a note, similar to the Transfer Amount field, the Note_Input.view.bxb file generates a form with a multi-line text field using textarea. This inputted value is passed as the transfer's Note. The Transfer structure is also updated accordingly.

Committing the Transfer

After users click Next, they have confirmed that the transaction can continue. Bixby uses the Transfer_Result dialog, which asks the user to Confirm the details. Bixby also loads the Transfer_Result.view.bxb file, which gives the details that were confirmed in the previous screen. This layout creates a number of layout-macro elements displaying the transfer properties for the relevant information.

This page is the users' last chance to make changes or cancel the transaction. If they do not want to proceed or need to change details, they can click the back button. If the users are happy with the details, they can press the Confirm transfer button. This confirmation button, as mentioned before, is handled by the precommit.transaction.bxb file.

on-user-click {
intent {
goal {

Once the user clicks this button, this transaction is moved to the commit phase and the next goal is the action model CommitTransfer, which is of type Commit.

Confirm the Transfer

CommitTransfer takes in the Transfer structure in its transaction concept state from CreateTransfer and outputs a TransferReceipt. The corresponding CommitTransfer JavaScript file takes in the transfer information and calls (http.oauthPostUrl)[$TOPICS//reference/JavaScriptAPI/http#http-oauthposturl-url-params-options-code-string-code-], sending that information to the OAuth endpoint. It expects to get a postResult object in return, letting Bixby know if the transfer went through. If successful, the transferTime information is populated and the TransferReceipt can be outputted.

Getting a Receipt

After users commit the transfer and the transfer completes, Bixby creates and displays a receipt using the TransferReceipt model and TransferReceipt_Result view:

The TransferReceipt model has the following properties:

  • A transfer structure, which is the same Transfer object that was inputted for CommitTransfer
  • A transferTime of type time.DateTime, which lets the user know when the transfer was successful

The TransferReceipt_Result view does the following:

  • In the layout, it takes the TransferReceipt.transfer structure and uses separate layout macros for each property that needs to be displayed in the transfer structure.
  • Also displays the transfer time in a separate section, with the help of the TransferTimeLabel template macro.

Additionally, Bixby uses the TransferCompleted template macro to let users know that the transfer was successful by saying Transfer completed.

The TransferReceipt_Result uses the sectioned content Bixby View component, with several cell components to list out each of the transfer's properties:

Transfer receipt

Training Your Capsule

The example.bank capsule comes with 24 training entries that test several use cases. You can test each training entry with the Simulator using the aligned NL. You can also view the resulting execution graph by clicking the down arrow in each training entry. This section goes into depth of four of these entries. It also includes information about how to use vocabulary in example.bank.

Training Entries Explained

The following training entries are not necessarily in the order found in the example.bank capsule, but they are referred to in the rest of this section as listed.

  • Training Entry 1: "Transfer $10"

      aligned-nl("[g:example.bank.CreateTransfer] Transfer {[g:example.bank.TransferAmount] ($)[v:viv.money.PrefixSymbol:$](10)[v:viv.money.CurrencyValue]}")

    The first training entry goal is CreateTransfer. It has the "$10" annotated as the transfer amount, specifically with the "$" as the prefix symbol and "10" as the currency value. Bixby prompts you twice for the accounts: once for the "To" account and again for the "From" account.

Account Prompt

It shows a confirmation page with this information, and you can choose to change the input values or add a note to the transfer. This is how your transfer details should look in the Simulator:

Training entry 1 results

Clicking "Confirm Transfer of $10" results in the receipt with transfer details that match the confirmation page.

  • Training Entry 2: "Transfer $1000 from my checking account to my savings account"

    [g:CreateTransfer] Transfer {[g:TransferAmount] ($)[v:viv.money.PrefixSymbol:$](1000)[v:viv.money.CurrencyValue]} from my {[g:FromAccount] (checking)[v:AccountType:Checking]} account to my {[g:ToAccount] (savings)[v:AccountType:Savings]} account

    The second training entry has all the required inputs for the goal of CreateTransfer: "$1000" for transferAmount (with "$" for prefix symbol and "1000" for currency value), checking for fromAccount, and savings for toAccount. Even though the query has provided enough information to make the transfer, Bixby still creates a confirmation page with editable fields:

    Training entry 2 confirmation page

  • Training Entry 3: "Transfer from my Money Market account"

    [g:CreateTransfer:continue] Transfer from my {[g:FromAccount] (Money Market)[v:AccountType:MoneyMarket]}   account

    The third training entry is a Continuation, since it continues off of an utterance. Therefore, the goal is still set to CreateTransfer, but the Specialization field is set to Continuation of and the Specialization node is set to example.bank.CreateTransfer. For example, if a user says "Transfer $10", the planner triggers prompts for the To and From accounts for the user.

    The user could then follow-up with the utterance "Transfer from my Money Market account". This updates the Transfer structure to have the fromAccount be a MoneyMarket account type instead. Alternatively, if users start with an utterance like "Transfer $1000 from my checking account to my savings account", they can change their mind and tell Bixby "Transfer from my Money Market account" as a continuation, and the planner will update the fromAccount to be MoneyMarket accordingly.

  • Training Entry 4: "Transfer $10 from my savings account to my Money Market account for my college fund"

    [g:CreateTransfer] Transfer {[g:TransferAmount] ($)[v:viv.money.PrefixSymbol:$](10)[v:viv.money.CurrencyValue]} from my {[g:FromAccount] (savings)[v:AccountType:Savings]} account to my {[g:ToAccount] (Money Market)[v:AccountType:MoneyMarket]} account for (my college fund)[v:Note]

    The final entry is essentially the same as the second training entry, but with a note! This training entry uses open text matching, meaning that Bixby is not restricted to a certain set of values that the note can be. In this case, the entry annotates "my college fund" as the note. This is unlike transferAmount, where Bixby is specifically looking for a currency prefix symbol and value. This is also unlike either of the accounts, since AccountType is an enum with three specific allowable symbols: Checking, Savings, and MoneyMarket. When you run this utterance in the test console, this is the resulting receipt:

    Training entry 4 receipt

Some of the capsule's training entries are variations on a single use case. For example, "Transfer $10" and "Transfer $1000" operate similarly and follow the same design pattern, but only differentiates in the currency value ("10" versus "1000"). Similarly, "Transfer $10 to my savings from my checking account for my college fund" and "Transfer $10 from my savings account to my Money Market account for my college fund" have the same transferAmount ("$10") and note ("my college fund"), but they differ in which accounts are used. This variety of training enables Bixby to learn in general what to expect from user utterances and how to handle different situations. For more information on training best practices, see The Art and Science of Training.


In addition to training, example.bank utilizes vocabulary to help Bixby understand utterances further. The vocab folder contains one vocabulary file:

  • AccountType: This vocab lists the various enum symbols and the variations of these accounts that a user might say or write.

Additional Notes About This Capsule

At the moment, there are a number of things that can be improved in this capsule:

  • There is currently no mechanism to check if the "to" and "from" accounts are the same. You can validate the selected accounts with CreateTransfer before continuing with the transfer to work around this.
  • Similarly, there is no way to handle the edge case of a user with a single account. Again, validating the inputs fixes this issue.
  • If you need to log out of your OAuth session in the Simulator, you can do this remove accounts under the OAuth section of the User tab.

Notice also that there are two files with several template-macro-def keys defined. The ui-strings.dialog.bxb handles all the UI strings, such as buttons or labels for prompts, as explained in Confirming the Transfer The nlg-strings.dialog.bxb handles any dialog that Bixby gives to the user. This practice is recommended especially if you are planning to localize your docs.