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woocommerce/plugins/woocommerce-blocks/docs/internal-developers/block-client-apis/checkout/checkout-api.md

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Checkout API interface

Note on migration: We are in the process of moving much of the data from contexts into data stores, so this portion of the docs may change often as we do this. We will endavour to keep it up to date while the work is carried out

Table of Contents

This document gives an overview of some of the major architectural components/APIs for the checkout block. If you haven't already, you may also want to read about the Checkout Flow and Events.

Data Stores

We are transitioning much of what is now available in Contexts, to @wordpress/data stores.

Checkout Data Store

This is responsible for holding all the data required for the checkout process.

The following data is available:

  • status: The status of the current checkout. Possible values are pristine, idle, processing, complete, before_processing or after_processing
  • hasError: This is true when anything in the checkout has created an error condition state. This might be validation errors, request errors, coupon application errors, payment processing errors etc.
  • redirectUrl: The current set url that the checkout will redirect to when it is complete.
  • orderId: The order id for the order attached to the current checkout.
  • customerId: The ID of the customer if the customer has an account, or 0 for guests.
  • calculatingCount: If any of the totals, taxes, shipping, etc need to be calculated, the count will be increased here.
  • paymentResult: The result of processing the payment.
  • useShippingAsBilling: Should the billing form be hidden and inherit the shipping address?
  • shouldCreateAccount: Should a user account be created with this order?
  • extensionData: This is used by plugins that extend Cart & Checkout to pass custom data to the Store API on checkout processing
  • orderNotes: Order notes introduced by the user in the checkout form.
Selectors

Data can be accessed through the following selectors:

  • getCheckoutState(): Returns all the data above.
  • isComplete(): True when checkout has finished processing and the subscribed checkout processing callbacks have all been invoked along with a successful processing of the checkout by the server.
  • isIdle(): When the checkout status is IDLE this flag is true. Checkout will be this status after any change to checkout state after the block is loaded. It will also be this status when retrying a purchase is possible after processing happens with an error.
  • isBeforeProcessing(): When the checkout status is BEFORE_PROCESSING this flag is true. Checkout will be this status when the user submits checkout for processing.
  • isProcessing(): When the checkout status is PROCESSING this flag is true. Checkout will be this status when all the observers on the event emitted with the BEFORE_PROCESSING status are completed without error. It is during this status that the block will be sending a request to the server on the checkout endpoint for processing the order.
  • isAfterProcessing(): When the checkout status is AFTER_PROCESSING this flag is true. Checkout will have this status after the the block receives the response from the server side processing request.
  • isComplete(): When the checkout status is COMPLETE this flag is true. Checkout will have this status after all observers on the events emitted during the AFTER_PROCESSING status are completed successfully. When checkout is at this status, the shopper's browser will be redirected to the value of redirectUrl at that point (usually the order-received route).
  • isCalculating(): This is true when the total is being re-calculated for the order. There are numerous things that might trigger a recalculation of the total: coupons being added or removed, shipping rates updated, shipping rate selected etc. This flag consolidates all activity that might be occurring (including requests to the server that potentially affect calculation of totals). So instead of having to check each of those individual states you can reliably just check if this boolean is true (calculating) or false (not calculating).
  • hasOrder(): This is true when orderId is truthy.
  • hasError(): This is true when the checkout has an error.
  • getOrderNotes(): Returns the order notes.
  • getCustomerId(): Returns the customer ID.
Actions

The following actions can be dispatched from the Checkout data store:

  • __internalSetIdle(): Set state.status to idle
  • __internalSetComplete(): Set state.status to complete
  • __internalSetProcessing(): Set state.status to processing
  • __internalSetPaymentResult( response: PaymentResult ): Set state.paymentResult to response
  • __internalSetBeforeProcessing(): Set state.status to before_processing
  • __internalSetAfterProcessing(): Set state.status to after_processing
  • __internalSrocessCheckoutResponse( response: CheckoutResponse ): This is a thunk that will extract the paymentResult from the CheckoutResponse, and dispatch 3 actions: __internalSetRedirectUrl, __internalSetPaymentResult and __internalSetAfterProcessing.
  • __internalSetRedirectUrl( url: string ): Set state.redirectUrl to url
  • __internalSetHasError( trueOrFalse: bool ): Set state.hasError to trueOrFalse
  • __internalIncrementCalculating(): Increment state.calculatingCount
  • __internalDecrementCalculating(): Decrement state.calculatingCount
  • __internalSetCustomerId( id: number ): Set state.customerId to id
  • __internalSetUseShippingAsBilling( useShippingAsBilling: boolean ): Set state.useShippingAsBilling to useShippingAsBilling
  • __internalSetShouldCreateAccount( shouldCreateAccount: boolean ): Set state.shouldCreateAccount to shouldCreateAccount
  • __internalSetOrderNotes( orderNotes: string ): Set state.orderNotes to orderNotes
  • __internalSetExtensionData( extensionData: Record< string, Record< string, unknown > > ): Set state.extensionData to extensionData

Contexts

Much of the data and api interface for components in the Checkout Block are constructed and exposed via usage of React.Context. In some cases the context maintains the "tree" state within the context itself (via useReducer) and in others it interacts with a global wp.data store (for data that communicates with the server).

You can find type definitions (typedef) for contexts in this file.

Customer Data Context

The customer data context exposes the api interfaces for the following things via the useCustomerDataContext hook:

  • billingData: The currently set billing data.
  • setBillingData: A state updated for updating the billing data state with new billing data.
  • shippingAddress: The current set shipping address.
  • setShippingAddress: A function for setting the shipping address. This will trigger shipping rates updates.

Shipping Method Data context

The shipping method data context exposes the api interfaces for the following things (typedef ShippingMethodDataContext) via the useShippingMethodData hook:

  • shippingErrorStatus: The current error status for the context.
  • dispatchErrorStatus: A function for dispatching a shipping error status. Used in combination with...
  • shippingErrorTypes: An object with the various error statuses that can be dispatched (NONE, INVALID_ADDRESS, UNKNOWN)
  • onShippingRateSuccess: This is a function for registering a callback to be invoked when shipping rates are retrieved successfully. Callbacks will receive the new rates as an argument.
  • onShippingRateFail: This is a function for registering a callback to be invoked when shipping rates fail to be retrieved. Callbacks will receive the error status as an argument.
  • onShippingRateSelectSuccess: This is a function for registering a callback to be invoked when shipping rate selection is successful.
  • onShippingRateSelectFail: This is a function for registering a callback to be invoked when shipping rates selection is unsuccessful.

Payment Method Events Context

The payment method events context exposes any event handlers related to payments (typedef PaymentEventsContext) via the usePaymentEventsContext hook.

  • onPaymentProcessing: This is an event subscriber that can be used to subscribe observers to be called when the status for the context is PROCESSING.

Checkout Events Context

The checkout events contexy exposes any event handlers related to the processing of the checkout:

  • onSubmit: This is a callback to be invoked either by submitting the checkout button, or by express payment methods to start checkout processing after they have finished their initialization process when their button has been clicked.
  • onCheckoutValidationBeforeProcessing: Used to register observers that will be invoked at validation time, after the checkout has been submitted but before the processing request is sent to the server.
  • onCheckoutAfterProcessingWithSuccess: Used to register observers that will be invoked after checkout has been processed by the server successfully.
  • onCheckoutAfterProcessingWithError: Used to register observers that will be invoked after checkout has been processed by the server and there was an error.

Hooks

These docs currently don't go into detail for all the hooks as that is fairly straightforward from existing implementations. However, one important extension interface hook will be highlighted here, usePaymentMethodInterface.

usePaymentMethodInterface

This hook is used to expose all the interfaces for the registered payment method components to utilize. Essentially the result from this hook is fed in as props on the registered payment components when they are setup by checkout. You can use the typedef (PaymentMethodInterface) to see what is fed to payment methods as props from this hook.

Why don't payment methods just implement this hook?

The contract is established through props fed to the payment method components via props. This allows us to avoid having to expose the hook publicly and experiment with how the props are retrieved and exposed in the future.