BrainerceMerge carts
Merges a guest cart into the cart of the logged-in customer, inside one transaction so two tabs cannot double the quantities. Call it right after login. The response is the customer cart.
For /api/vc/{connectionId}/* routes the connectionId (vc_*) is in the URL path — not a header. Live-mode requests must also send a matching Origin header.
In: header
Path Parameters
Sales channel ID (vc_*), the canonical salesChannelId. connectionId is the deprecated name of the same value and is still the literal path segment.
Query Parameters
Language code, for example he. Used only when no Accept-Language header is sent. A language the store does not support, or the store's default language, returns the default text.
Header Parameters
Origin of the storefront page making the call, for example https://shop.example.com. Required: a request with no Origin header is refused with 403. On a LIVE channel its host must equal the channel's registered domain (or one of its subdomains) or match an allowed origin. A TEST channel with no domain accepts any origin; once a domain is set it is matched as on LIVE.
Customer token as Bearer <token>, returned by customers/login, customers/register or the OAuth callback. Expires after 7 days. It is a customer token, never an API key.
Preferred language, for example he. Its first tag is used when it is one of the store's supported languages other than the default; translated fields are then returned in that language. Falls back to the locale query parameter.
Version of the calling SDK (the Brainerce SDK sends it automatically). Informational: it is recorded on the channel and never changes the response.
Guest session token to merge into the customer cart.
length <= 200curl -X POST "https://api.brainerce.com/api/vc/string/cart/merge?locale=string" \ -H "origin: string" \ -H "authorization: string" \ -H "accept-language: string" \ -H "X-SDK-Version: string" \ -H "Content-Type: application/json" \ -d '{ "sessionToken": "string" }'{
"id": "clcrt_abc123",
"sessionToken": "string",
"customerId": "clcustomer_abc123",
"status": "ACTIVE",
"currency": "USD",
"notes": "string",
"analyticsClientId": "clanalyticsclient_abc123",
"analyticsSessionId": "clanalyticssession_abc123",
"subtotal": "39.80",
"discountAmount": "5.00",
"ruleDiscountAmount": "0",
"promoDiscountTotal": "0",
"couponCode": "WELCOME10",
"appliedDiscounts": [
{
"ruleId": "cldr_abc123",
"ruleName": "string",
"type": "PRODUCT_DISCOUNT",
"discountAmount": "5.00",
"description": "string"
}
],
"nudges": [
{
"ruleId": "cldr_abc123",
"text": "string",
"type": "AMOUNT_NEEDED",
"amountNeeded": "12.00",
"quantityNeeded": 1
}
],
"items": [
{
"id": "clx1234567890",
"productId": "clprd_abc123",
"variantId": "clvariant_abc123",
"quantity": 2,
"unitPrice": "19.90",
"currentUnitPrice": "21.90",
"priceChanged": true,
"priceDelta": "2.00",
"priceDirection": "increased",
"isAvailable": true,
"unavailableReason": null,
"discountAmount": "0",
"promoDiscountAmount": "0",
"promoSource": "BUNDLE",
"promoSourceId": "clpromosource_abc123",
"notes": "string",
"metadata": {},
"customizations": {},
"product": {
"id": "clprd_abc123",
"name": "string",
"sku": "MUG-BLU",
"images": [
{
"url": "https://cdn.brainerce.com/products/abc123.jpg",
"alt": "Blue mug"
}
]
},
"variant": {
"id": "clvar_abc123",
"name": "string",
"sku": "MUG-BLU-L",
"image": {
"url": "https://cdn.brainerce.com/products/abc123.jpg",
"alt": "Blue mug"
}
},
"modifiers": [
{
"modifierId": "clmod_abc123",
"modifierGroupId": "clmgr_abc123",
"name": "string",
"priceDelta": "1.50",
"freeApplied": false,
"effectivePrice": "1.50",
"positionInGroup": 0
}
],
"modifiersTotal": "1.50",
"parentCartItemId": "clparentcartitem_abc123",
"createdAt": "2026-01-15T10:30:00.000Z",
"updatedAt": "2026-01-15T10:30:00.000Z"
}
],
"itemCount": 3,
"hasPriceChanges": false,
"hasUnavailableItems": false,
"unavailableItemIds": [],
"expiresAt": "2026-01-15T10:30:00.000Z",
"createdAt": "2026-01-15T10:30:00.000Z",
"updatedAt": "2026-01-15T10:30:00.000Z",
"reservation": {
"hasReservation": true,
"expiresAt": "2026-01-15T10:30:00.000Z",
"remainingSeconds": 540,
"strategy": "ON_CART",
"countdownMessage": "string"
},
"recommendations": {
"recommendations": [
{
"id": "clprd_abc123",
"name": "string",
"slug": "blue-mug",
"basePrice": "24.00",
"salePrice": "19.99",
"images": [
{
"url": "https://cdn.brainerce.com/products/abc123.jpg",
"alt": "Blue mug"
}
],
"type": "SIMPLE",
"inventory": {
"total": 42,
"available": 39,
"trackingMode": "TRACKED",
"inStock": true,
"canPurchase": true
},
"targetVariantId": null,
"requiresVariantSelection": false,
"pinnedVariant": {
"id": "clvar_abc123",
"name": "string",
"attributes": {}
},
"variants": [
{
"id": "clvar_abc123",
"name": "string",
"attributes": {},
"image": {
"url": "https://cdn.brainerce.com/products/abc123.jpg",
"alt": "Blue mug"
},
"price": "24.00",
"salePrice": null
}
],
"relationType": "CROSS_SELL"
}
]
},
"upgrades": {
"upgrades": {}
},
"bundles": {
"bundles": [
{
"id": "clx1234567890",
"name": "string",
"description": "string",
"triggerProductId": "cltriggerproduct_abc123",
"productIds": [
"string"
],
"offeredProducts": [
{
"id": "clprd_abc123",
"name": "string",
"slug": "blue-mug",
"basePrice": "30.00",
"salePrice": "19.99",
"images": [
{
"url": "https://cdn.brainerce.com/products/abc123.jpg",
"alt": "Blue mug"
}
],
"type": "SIMPLE",
"variantId": "clvariant_abc123",
"requiresVariantSelection": false,
"pinnedVariant": {
"id": "clvar_abc123",
"name": "string",
"attributes": {}
},
"variants": [
{
"id": "clvar_abc123",
"name": "string",
"attributes": {},
"image": {
"url": "https://cdn.brainerce.com/products/abc123.jpg",
"alt": "Blue mug"
},
"price": "24.00",
"salePrice": null
}
],
"originalPrice": "30.00",
"discountedPrice": "24.00"
}
],
"discountType": "PERCENTAGE",
"discountValue": "20",
"totalOriginalPrice": "30.00",
"totalDiscountedPrice": "24.00"
}
]
}
}{
"statusCode": 400,
"code": "VALIDATION_FAILED",
"message": "name should not be empty, price must be a positive number",
"timestamp": "2026-08-23T10:15:00.000Z",
"path": "/api/vc/{connectionId}/cart/merge"
}{
"statusCode": 401,
"code": "UNAUTHORIZED",
"message": "Invalid or expired credential",
"timestamp": "2026-08-23T10:15:00.000Z",
"path": "/api/vc/{connectionId}/cart/merge"
}{
"statusCode": 403,
"code": "INSUFFICIENT_SCOPE",
"message": "API key does not have the required scope: products:write",
"timestamp": "2026-08-23T10:15:00.000Z",
"path": "/api/vc/{connectionId}/cart/merge"
}{
"statusCode": 404,
"code": "RESOURCE_NOT_FOUND",
"message": "Resource not found",
"timestamp": "2026-08-23T10:15:00.000Z",
"path": "/api/vc/{connectionId}/cart/merge"
}{
"statusCode": 409,
"code": "CONFLICT",
"message": "The request conflicts with the current state of the resource",
"timestamp": "2026-08-23T10:15:00.000Z",
"path": "/api/vc/{connectionId}/cart/merge"
}{
"statusCode": 429,
"code": "RATE_LIMITED",
"message": "Too many requests",
"details": {
"retryAfterSeconds": 12
},
"timestamp": "2026-08-23T10:15:00.000Z",
"path": "/api/vc/{connectionId}/cart/merge"
}