B2C Commerce Hooks

Hooks are extension points that allow you to customize business logic by registering scripts. B2C Commerce supports two types of hooks:

1. OCAPI/SCAPI Hooks - Extend API resources with before, after, and modifyResponse hooks
2. System Hooks - Custom extension points for order calculation, payment, and other core functionality

Hook Types Overview

Type	Purpose	Examples
OCAPI/SCAPI	Extend API behavior	dw.ocapi.shop.basket.afterPOST
System	Core business logic	dw.order.calculate
Custom	Your own extension points	app.checkout.validate

Hook Registration

File Structure

my_cartridge/
├── package.json           # References hooks.json
└── cartridge/
    └── scripts/
        ├── hooks.json     # Hook registrations
        └── hooks/         # Hook implementations
            ├── basket.js
            └── order.js

package.json

Reference the hooks configuration file:

{
  "name": "my_cartridge",
  "hooks": "./cartridge/scripts/hooks.json"
}

hooks.json

Register hooks with their implementing scripts:

{
  "hooks": [
    {
      "name": "dw.ocapi.shop.basket.afterPOST",
      "script": "./hooks/basket.js"
    },
    {
      "name": "dw.ocapi.shop.basket.modifyPOSTResponse",
      "script": "./hooks/basket.js"
    },
    {
      "name": "dw.order.calculate",
      "script": "./hooks/order.js"
    }
  ]
}

Hook Script

Export functions matching the hook method name (without package prefix):

// hooks/basket.js
var Status = require('dw/system/Status');

exports.afterPOST = function(basket) {
    // Called after basket creation
    // Returning a value would skip system implementation
};

exports.modifyPOSTResponse = function(basket, basketResponse) {
    // Modify the API response
    basketResponse.c_customField = 'value';
};

HookMgr API

Use dw.system.HookMgr to call hooks programmatically:

var HookMgr = require('dw/system/HookMgr');

// Check if hook exists
if (HookMgr.hasHook('dw.order.calculate')) {
    // Call the hook
    var result = HookMgr.callHook('dw.order.calculate', 'calculate', basket);
}

Method	Description
hasHook(extensionPoint)	Returns true if hook is registered or has default implementation
callHook(extensionPoint, functionName, args...)	Calls the hook, returns result or undefined

Status Object

Hooks return dw.system.Status to indicate success or failure:

var Status = require('dw/system/Status');

// Success - continue processing
return new Status(Status.OK);

// Error - stop processing, rollback transaction
var status = new Status(Status.ERROR);
status.addDetail('error_code', 'INVALID_ADDRESS');
status.addDetail('message', 'Address validation failed');
return status;

Status	HTTP Response	Behavior
Status.OK	Continues	Hook execution continues
Status.ERROR	400 Bad Request	Transaction rolled back, processing stops
Uncaught exception	500 Internal Error	Transaction rolled back

Return Value Behavior (Important)

OCAPI/SCAPI hooks that return ANY value will SKIP the system implementation and all subsequent registered hooks for that extension point.

This is a common source of bugs. For example, if a hook returns Status.OK, the system's dw.order.calculate implementation won't run, causing cart totals to be incorrect.

When to Return a Value

Return a Status object only when you want to:

• Stop processing with an error (Status.ERROR)
• Skip the system implementation intentionally

When NOT to Return a Value

To ensure system implementations run (like cart calculation), return nothing:

// Returning Status.OK skips system implementation
exports.afterPOST = function(basket) {
    doSomething(basket);
    return new Status(Status.OK);  // Skips dw.order.calculate
};

// No return value - system implementation runs
exports.afterPOST = function(basket) {
    doSomething(basket);
    // No return, or explicit: return;
};

Summary

Return Value	OCAPI/SCAPI Behavior	Custom Hook Behavior
undefined (no return)	System implementation runs, subsequent hooks run	All hooks run
Status.OK	Skips system implementation and subsequent hooks	All hooks run
Status.ERROR	Stops processing, returns error	All hooks run

Debugging tip: If cart totals are wrong or hooks aren't firing, check if an earlier hook is returning a value.

OCAPI/SCAPI Hooks

OCAPI and SCAPI share the same hooks. Enable in Business Manager: Administration > Global Preferences > Feature Switches > Enable Salesforce Commerce Cloud API hook execution

Hook Types

Hook	When Called	Use Case
before<METHOD>	Before processing	Validation, access control
after<METHOD>	After processing (in transaction)	Data modification, external calls
modify<METHOD>Response	Before response sent	Add/modify response properties

Common Hook Patterns

// Validation in beforePUT
exports.beforePUT = function(basket, addressDoc) {
    if (!isValidAddress(addressDoc)) {
        var status = new Status(Status.ERROR);
        status.addDetail('validation_error', 'Invalid address');
        return status;
    }
};

// External call in afterPOST (within transaction)
exports.afterPOST = function(basket, paymentDoc) {
    var result = callPaymentService(paymentDoc);
    request.custom.paymentResult = result; // Pass to modifyResponse
    // Returning a Status would skip system implementation
};

// Modify response
exports.modifyPOSTResponse = function(basket, basketResponse, paymentDoc) {
    basketResponse.c_paymentStatus = request.custom.paymentResult.status;
};

Passing Data Between Hooks

Use request.custom to pass data between hooks in the same request:

// In afterPOST
exports.afterPOST = function(basket, doc) {
    request.custom.externalId = callExternalService();
};

// In modifyPOSTResponse
exports.modifyPOSTResponse = function(basket, response, doc) {
    response.c_externalId = request.custom.externalId;
};

Detect SCAPI vs OCAPI

exports.afterPOST = function(basket) {
    if (request.isSCAPI()) {
        // SCAPI-specific logic
    } else {
        // OCAPI-specific logic
    }
};

System Hooks

Calculate Hooks

Extension Point	Function	Purpose
dw.order.calculate	calculate	Full basket/order calculation
dw.order.calculateShipping	calculateShipping	Shipping calculation
dw.order.calculateTax	calculateTax	Tax calculation

// hooks/calculate.js
var Status = require('dw/system/Status');
var HookMgr = require('dw/system/HookMgr');

exports.calculate = function(lineItemCtnr) {
    // Calculate shipping
    HookMgr.callHook('dw.order.calculateShipping', 'calculateShipping', lineItemCtnr);

    // Calculate promotions, totals...

    // Calculate tax
    HookMgr.callHook('dw.order.calculateTax', 'calculateTax', lineItemCtnr);

    return new Status(Status.OK);
};

Payment Hooks

Extension Point	Function	Purpose
dw.order.payment.authorize	authorize	Payment authorization
dw.order.payment.capture	capture	Capture authorized payment
dw.order.payment.refund	refund	Refund payment
dw.order.payment.validateAuthorization	validateAuthorization	Check authorization validity
dw.order.payment.reauthorize	reauthorize	Re-authorize expired auth

Order Hooks

Extension Point	Function	Purpose
dw.order.createOrderNo	createOrderNo	Custom order number generation

var OrderMgr = require('dw/order/OrderMgr');
var Site = require('dw/system/Site');

exports.createOrderNo = function() {
    var seqNo = OrderMgr.createOrderSequenceNo();
    var prefix = Site.current.ID;
    return prefix + '-' + seqNo;
};

Custom Hooks

Create your own extension points:

// Define custom hook
var HookMgr = require('dw/system/HookMgr');

function processCheckout(basket) {
    // Call custom hook if registered
    if (HookMgr.hasHook('app.checkout.validate')) {
        var status = HookMgr.callHook('app.checkout.validate', 'validate', basket);
        if (status && status.error) {
            return status;
        }
    }
    // Continue processing...
}

Register in hooks.json:

{
  "hooks": [
    {
      "name": "app.checkout.validate",
      "script": "./hooks/checkout.js"
    }
  ]
}

Custom hooks always execute all registered implementations regardless of return value.

Remote Includes in Hooks

Enhance API responses with data from other SCAPI endpoints:

var RESTResponseMgr = require('dw/system/RESTResponseMgr');

exports.modifyGETResponse = function(product, doc) {
    // Include Custom API response
    var include = RESTResponseMgr.createScapiRemoteInclude(
        'custom',           // API family
        'my-api',           // API name
        'v1',               // Version
        'endpoint'          // Endpoint
    );
    doc.c_additionalData = { value: [include] };
};

Best Practices

• Return undefined (no return) from OCAPI/SCAPI hooks to ensure system implementations run
• Only return Status.ERROR when you need to stop processing
• Returning Status.OK skips system implementation and subsequent hooks
• Use request.custom to pass data between hooks
• Check request.isSCAPI() when supporting both APIs
• Keep hooks focused and performant
• Use custom properties (c_ prefix) in modifyResponse
• Avoid transactions in calculate hooks (breaks SCAPI)
• Avoid slow external calls in beforeGET (affects caching)

Error Handling

Circuit Breaker

Too many hook errors triggers circuit breaker (HTTP 503):

{
  "title": "Hook Circuit Breaker",
  "type": "https://api.commercecloud.salesforce.com/.../hook-circuit-breaker",
  "detail": "Failure rate above threshold of '50%'",
  "extensionPointName": "dw.ocapi.shop.basket.afterPOST"
}

Timeout

Hooks must complete within the SCAPI timeout (HTTP 504 on timeout).

Detailed References

• OCAPI/SCAPI Hooks - API hook patterns and available hooks
• System Hooks - Calculate, payment, and order hooks