Managing Guest Carts

Last updated: January 16, 2020

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The Carts API provides access to management of customers’ shopping carts. The following document covers working with guest carts.

Guest carts come with an expiration date, which means that unregistered users can use their carts only for a limited time frame. After the lifetime of a guest cart expires, it is deleted by the system automatically.It is up to you to decide, how long you want them to be saved. Also, with the introduction of the Carts API, comes the possibility to persist guest carts. While carts for registered customers have always been persisted, the introduction of the API brings possibility to persist carts of guest customers.

Only one cart can be created for each guest customer.

If you want to know how to process carts of registered users, see [Managing Carts of Registered Users](/docs/scos/dev/glue-api-guides/201907.0/managing-carts/carts-of-registered-users/managing-carts-of-registered-users.html).

Installation

For detailed information on the modules that provide the API functionality and related installation instructions, see Carts API.

Resources for Accessing Guest Carts

The /guest-carts and /guest-cart-items resources provide endpoints to manage carts of users who haven’t yet registered in the system or authenticated with the Glue REST API. Such carts provide the possibility for users to place items on a cart without the necessity to provide any registration information.

Each guest customer is identified by the value of the X-Anonymous-Customer-Unique-Id header. The header needs to be passed with each request related to a guest user. Glue REST API does not assign unique IDs to guest customer users. It is the responsibility of the API client to generate and manage unique IDs for all guest user sessions.

Creating a Guest Cart

To create a guest cart for an unauthenticated user, you simply need to place an item or several items on a new guest card. To do this, send a POST request to the following endpoint:

/guest-cart-items

Request sample: POST http://mysprykershop.com/guest-cart-items

Request

Headers:

X-Anonymous-Customer-Unique-Id - specifies a unique guest user ID for the new cart. If the specified user already has a cart, the item or items will be added on their existing cart instead of creating a new one.

Attributes:

Attribute	Type	Required	Description
sku	String	✓	Specifies the SKU part number of the item to place on the new guest cart.
quantity	String	✓	Specifies the number of items to place on the guest cart.

Sample Request Body

{
	"data": {
		"type": "guest-cart-items",
		"attributes": {
			"sku": "022_21994751",
			"quantity": 1
		}
	}
}

Response

If a request was successful and a cart was created, the endpoint responds with a RestCartsResponse containing information about the new cart. Sample Response

{
	"data": {
		"type": "carts",
		"id": "2506b65c-164b-5708-8530-94ed7082e802",
		"attributes": {
			"priceMode": "GROSS_MODE",
			"currency": "EUR",
			"store": "DE",
			"discounts": [
				{
					"displayName": "10% Discount for all orders above",
					"amount": 9114,
					"code": null
				}
			],
			"totals": {
				"expenseTotal": 0,
				"discountTotal": 9114,
				"taxTotal": 9777,
				"subtotal": 91136,
				"grandTotal": 82022
			}
		},
		"links": {
			"self": "http://mysprykershop.com/carts/2506b65c-164b-5708-8530-94ed7082e802"
		},
			"relationships": {
				"items": {
					"data": [
						{
							"type": "items",
							"id": "022_21994751"
						}
					]
				}
			}
		},
		"included": [
			{
				"type": "concrete-product-image-sets",
				"id": "022_21994751",
				"attributes": {
					"imageSets": [
						{
							"name": "default",
							"images": [
								{
									"externalUrlLarge": "//images.icecat.biz/img/norm/high/21994751-Sony.jpg",
									"externalUrlSmall": "//images.icecat.biz/img/norm/medium/21994751-Sony.jpg"
								}
							]
						},
						{
							"name": "default",
							"images": [
								{
									"externalUrlLarge": "//images.icecat.biz/img/norm/high/21994751-Sony.jpg",
									"externalUrlSmall": "//images.icecat.biz/img/norm/medium/21994751-Sony.jpg"
								}
							]
						}
					]
				},
					"links": {
						"self": "http://mysprykershop.com/concrete-products/022_21994751/concrete-product-image-sets"
				}
			},
			{
				"type": "concrete-product-availabilities",
				"id": "022_21994751",
				"attributes": {
					"availability": true,
					"quantity": 10,
					"isNeverOutOfStock": true
				},
				"links": {
					"self": "http://mysprykershop.com/concrete-products/022_21994751/concrete-product-availabilities"
				}
			},
			{
				"type": "concrete-product-prices",
				"id": "022_21994751",
				"attributes": {
					"price": 26000,
					"prices": [
						{
							"priceTypeName": "DEFAULT",
							"netAmount": null,
							"grossAmount": 26000
						}
					]
				},
				"links": {
					"self": "http://mysprykershop.com/concrete-products/022_21994751/concrete-product-prices"
				}
			},
			{
				"type": "concrete-products",
				"id": "022_21994751",
				"attributes": {
					"sku": "022_21994751",
					"name": "Sony Cyber-shot DSC-WX220",
					"description": "Styled for your pocket  Precision photography meets the portability of a smartphone. The W800 is small enough to take great photos, look good while doing it, and slip in your pocket. Shooting great photos and videos is easy with the W800. Buttons are positioned for ease of use, while a dedicated movie button makes shooting movies simple. The vivid 2.7-type Clear Photo LCD display screen lets you view your stills and play back movies with minimal effort. Whip out the W800 to capture crisp, smooth footage in an instant. At the press of a button, you can record blur-free 720 HD images with digital sound. Breathe new life into a picture by using built-in Picture Effect technology. There’s a range of modes to choose from – you don’t even have to download image-editing software.",
					"attributes": {
						"megapixel": "18.2 MP",
						"display": "LCD",
						"digital_zoom": "20 x",
						"sensor_type": "CMOS",
						"brand": "Sony",
						"color": "Gold"
					},
					"superAttributesDefinition": [
						"color"
					],
					"metaTitle": "Sony Cyber-shot DSC-WX220",
					"metaKeywords": "Sony,Entertainment Electronics",
					"metaDescription": "Styled for your pocket  Precision photography meets the portability of a smartphone. The W800 is small enough to take great photos, look good while doing i"
				},
				"links": {
					"self": "http://mysprykershop.com/concrete-products/022_21994751"
				},
				"relationships": {
					"concrete-product-image-sets": {
						"data": [
							{
								"type": "concrete-product-image-sets",
								"id": "022_21994751"
							}
						]
					},
					"concrete-product-availabilities": {
						"data": [
							{
								"type": "concrete-product-availabilities",
								"id": "022_21994751"
							}
						]
					},
					"concrete-product-prices": {
						"data": [
							{
								"type": "concrete-product-prices",
								"id": "022_21994751"
							}
						]
					}
				}
			},
			{
				"type": "items",
				"id": "022_21994751",
				"attributes": {
					"sku": "022_21994751",
					"quantity": 1,
					"groupKey": "022_21994751",
					"amount": null,
					"calculations": {
						"unitPrice": 26000,
						"sumPrice": 52000,
						"taxRate": 19,
						"unitNetPrice": 0,
						"sumNetPrice": 0,
						"unitGrossPrice": 26000,
						"sumGrossPrice": 52000,
						"unitTaxAmountFullAggregation": 3736,
						"sumTaxAmountFullAggregation": 7472,
						"sumSubtotalAggregation": 52000,
						"unitSubtotalAggregation": 26000,
						"unitProductOptionPriceAggregation": 0,
						"sumProductOptionPriceAggregation": 0,
						"unitDiscountAmountAggregation": 2600,
						"sumDiscountAmountAggregation": 5200,
						"unitDiscountAmountFullAggregation": 2600,
						"sumDiscountAmountFullAggregation": 5200,
						"unitPriceToPayAggregation": 23400,
						"sumPriceToPayAggregation": 46800
				}
			},
			"links": {
				"self": "http://mysprykershop.com/carts/2506b65c-164b-5708-8530-94ed7082e802/items/022_21994751"
			},
			"relationships": {
				"concrete-products": {
					"data": [
						{
							"type": "concrete-products",
							"id": "022_21994751"
						}
					]
				}
			}
		}
	]
}

Response Attributes General Cart Information

Field*	Type	Description
priceMode	String	Price mode that was active when the cart was created.
currency	String	Currency that was selected when the cart was created.
store	String	Store for which the cart was created.
*The fields mentioned are all attributes in the response. Type and ID are not mentioned.

Discount information

Field*	Type	Description
displayName	String	Discount name.
code	String	Discount code applied to the cart.
amount	Integer	Discount amount applied to the cart.
*The fields mentioned are all attributes in the response. Type and ID are not mentioned.

Totals Information

Field*	Type	Description
expenseTotal	String	Total amount of expenses (including e.g. shipping costs).
discountTotal	Integer	Total amount of discounts applied to the cart.
taxTotal	String	Total amount of taxes to be paid.
subTotal	Integer	Subtotal of the cart.
grandTotal	Integer	Grand total of the cart.
*The fields mentioned are all attributes in the response. Type and ID are not mentioned.

Cart Item Information

Field*	Type	Description
sku	String	SKU of the product.
quantity	Integer	Quantity of the given product in the cart.
groupKey	String	Unique item identifier. The value is generated based on product parameters.
amount	Integer	Amount of the products in the cart.
*The fields mentioned are all attributes in the response. Type and ID are not mentioned.

Cart Item Calculation Information

Field*	Type	Description
unitPrice	Integer	Single item price without assuming is it net or gross. This value should be used everywhere a price is disabled. It allows switching the tax mode without side effects.
sumPrice	Integer	Sum of all items prices calculated.
taxRate	Integer	Current tax rate in per cent.
unitNetPrice	Integer	Single item net price.
sumNetPrice	Integer	Sum of all items’ net price.
unitGrossPrice	Integer	Single item gross price.
sumGrossPrice	Integer	Sum of items gross price.
unitTaxAmountFullAggregation	Integer	Total tax amount for a given item with additions.
sumTaxAmountFullAggregation	Integer	Total tax amount for a given amount of items with additions.
sumSubtotalAggregation	Integer	Sum of subtotals of the items.
unitSubtotalAggregation	Integer	Subtotal for the given item.
unitProductOptionPriceAggregation	Integer	Item total product option price.
sumProductOptionPriceAggregation	Integer	Item total of product options for the given sum of items.
unitDiscountAmountAggregation	Integer	Item total discount amount.
sumDiscountAmountAggregation	Integer	Sum Item total discount amount.
unitDiscountAmountFullAggregation	Integer	Sum total discount amount with additions.
sumDiscountAmountFullAggregation	Integer	Item total discount amount with additions.
unitPriceToPayAggregation	Integer	Item total price to pay after discounts with additions.
sumPriceToPayAggregation	Integer	Sum of the prices to pay (after discounts).
*The fields mentioned are all attributes in the response. Type and ID are not mentioned.
The response contains a unique identifier returned in the id attribute and a self link that can be used to access the card in the future.

Possible Errors

Code	Reason
102	Failed to add an item to the new cart.
107	Failed to create a cart.
109	Anonymous customer ID is missing.

Retrieving Carts of Guest Users

There are 2 possible ways how you can access a cart of a guest user

By the unique identifier of the guest user

The user's unique identifier is passed in the **X-Anonymous-Customer-Unique-Id** header when creating a cart. It is managed by the API client.

`/guest-carts` Request sample: `GET http://mysprykershop.com/guest-carts` **Headers:** **X-Anonymous-Customer-Unique-Id** - specifies the unique guest user ID.

By the unique identifier of the cart

The unique identifier of the cart is passed by the Glue API in the id attribute of a **RestCartsResponse** when a new guest cart is created.

`/guest-carts/{{guestCartId}}` Request sample: `GET http://mysprykershop.com/guest-carts/2506b65c-164b-5708-8530-94ed7082e802` where `2506b65c-164b-5708-8530-94ed7082e802` is the ID of the cart you need.

Response

No matter which of the 2 endpoints you use, it will respond with a RestCartsResponse. Sample Response

{
	"data": [
		{
			"type": "carts",
			"id": "c481acf2-a4de-5d09-9d0d-c3fc5b1645ba",
			"attributes": {
				"priceMode": "GROSS_MODE",
				"currency": "EUR",
				"store": "DE",
				"discounts": [
					{
						"displayName": "10% Discount for all orders above",
						"amount": 4250,
						"code": null
					}
				],
					"totals": {
						"expenseTotal": 0,
						"discountTotal": 4250,
						"taxTotal": 6107,
						"subtotal": 42502,
						"grandTotal": 38252
					}
				},
					"links": {
						"self": "http://mysprykershop/carts/c481acf2-a4de-5d09-9d0d-c3fc5b1645ba"
				},
					"relationships": {
						"items": {
							"data": [
							{
								"type": "items",
								"id": "177_25913296"
							}
						]
					}
				}
			}
		],
		"links": {
			self": "http://mysprykershop/guest-carts"
		},
		"included": [
			{
				"type": "concrete-product-image-sets",
				"id": "177_25913296",
				"attributes": {
					"imageSets": [
						{
							"name": "default",
							"images": [
								{
									"externalUrlLarge": "//images.icecat.biz/img/norm/high/24867659-4916.jpg",
									"externalUrlSmall": "//images.icecat.biz/img/norm/medium/24867659-4916.jpg"
								}
							]
						},
						{
						"name": "default",
						"images": [
							{
								"externalUrlLarge": "//images.icecat.biz/img/norm/high/24867659-4916.jpg",
								"externalUrlSmall": "//images.icecat.biz/img/norm/medium/24867659-4916.jpg"
							}
						]
					}
				]
			},
			"links": {
				"self": "http://mysprykershop/concrete-products/177_25913296/concrete-product-image-sets"
			}
		},
		{
			"type": "concrete-product-availabilities",
			"id": "177_25913296",
			"attributes": {
				"availability": true,
				"quantity": 20,
				"isNeverOutOfStock": false
			},
			"links": {
				"self": "http://mysprykershop/concrete-products/177_25913296/concrete-product-availabilities"
			}
		},
		{
			"type": "concrete-product-prices",
				"id": "177_25913296",
				"attributes": {
					"price": 42502,
					"prices": [
						{
							"priceTypeName": "DEFAULT",
							"netAmount": null,
							"grossAmount": 42502
						}
					]
				},
				"links": {
					"self": "http://mysprykershop/concrete-products/177_25913296/concrete-product-prices"
				}
			},
			{
				"type": "concrete-products",
				"id": "177_25913296",
				"attributes": {
					"sku": "177_25913296",
					"name": "Samsung Galaxy Tab Active 8.0 32 GB",
					"description": "Water and Dust Resistance (IP67) Keep working continuously in virtually any environment with IP67 environmental sealing that protects against damage from water and dust. Gain toughness and stability without sacrificing a premium design with 9.75-mm thickness(without cover) and a 393-gram light weight with rugged reinforcement. Don’t worry about drops or impacts in active business environments. With its included cover, Samsung Galaxy Tab Active is designed to handle drops of up to 1.2 meters with protective cover (3.9 feet). Save time on communications and work process management with easy NFC device pairing and tag reading. A 3.1-megapixel (MP) Auto Focus (AF) camera with a Flash feature enables easy, efficient barcode scanning to facilitate communication and workflow.",
					"attributes": {
						"storage_media": "flash",
						"processor_frequency": "1.2 GHz",
						"display_diagonal": "20.3 cm",
						"aspect_ratio": "16:09",
						"brand": "Samsung",
						"internal_storage_capacity": "32 GB"
					},
					"superAttributesDefinition": [
						"storage_media",
						"processor_frequency",
						"internal_storage_capacity"
					],
					"metaTitle": "Samsung Galaxy Tab Active 8.0 8 GB",
					"metaKeywords": "Samsung,Communication Electronics",
					"metaDescription": "Water and Dust Resistance (IP67) Keep working continuously in virtually any environment with IP67 environmental sealing that protects against damage from w"
				},
				"links": {
					"self": "http://mysprykershop/concrete-products/177_25913296"
				},
				relationships": {
					"concrete-product-image-sets": {
						"data": [
							{
								"type": "concrete-product-image-sets",
								"id": "177_25913296"
							}
						]
					},
					"concrete-product-availabilities": {
						"data": [
							{
								"type": "concrete-product-availabilities",
								"id": "177_25913296"
							}
						]
					},
					"concrete-product-prices": {
						"data": [
							{
								"type": "concrete-product-prices",
								"id": "177_25913296"
							}
						]
					}
				}
			},
			{
			"type": "items",
			"id": "177_25913296",
			"attributes": {
				"sku": "177_25913296",
				"quantity": "1",
				"groupKey": "177_25913296",
				"amount": null,
				"calculations": {
					"unitPrice": 42502,
					"sumPrice": 42502,
					"taxRate": 19,
					"unitNetPrice": 0,
					"sumNetPrice": 0,
					"unitGrossPrice": 42502,
					"sumGrossPrice": 42502,
					"unitTaxAmountFullAggregation": 6107,
					"sumTaxAmountFullAggregation": 6107,
					"sumSubtotalAggregation": 42502,
					"unitSubtotalAggregation": 42502,
					"unitProductOptionPriceAggregation": 0,
					"sumProductOptionPriceAggregation": 0,
					"unitDiscountAmountAggregation": 4250,
					"sumDiscountAmountAggregation": 4250,
					"unitDiscountAmountFullAggregation": 4250,
					"sumDiscountAmountFullAggregation": 4250,
					"unitPriceToPayAggregation": 38252,
					"sumPriceToPayAggregation": 38252
				}
			},
			"links": {
				"self": "http://mysprykershop/carts/c481acf2-a4de-5d09-9d0d-c3fc5b1645ba/items/177_25913296"
			},
			"relationships": {
				"concrete-products": {
					"data": [
						{
							"type": "concrete-products",
							"id": "177_25913296"
						}
					]
				}
			}
		}
	]
}

Response Attributes General Cart Information

Field*	Type	Description
priceMode	String	Price mode that was active when the cart was created.
currency	String	Currency that was selected when the cart was created.
store	String	Store for which the cart was created.
*The fields mentioned are all attributes in the response. Type and ID are not mentioned.

Discount Information

Field*	Type	Description
displayName	String	Discount name.
amount	Integer	Discount amount applied to the cart.
code	String	Discount code applied to the cart.
*The fields mentioned are all attributes in the response. Type and ID are not mentioned.

Totals Information

Field*	Type	Description
expenseTotal	String	Total amount of expenses (including e.g. shipping costs)
discountTotal	Integer	Total amount of discounts applied to the cart.
taxTotal	String	Total amount of taxes to be paid.
subTotal	Integer	Subtotal of the cart.
grandTotal	Integer	rand total of the cart.
*The fields mentioned are all attributes in the response. Type and ID are not mentioned.

Cart Item Information

Field*	Type	Description
sku	String	SKU of the product.
quantity	Integer	Quantity of the given product in the cart.
groupKey	String	Unique item identifier. The value is generated based on product parameters.
amount	Integer	Amount of the product in the cart.
*The fields mentioned are all attributes in the response. Type and ID are not mentioned.

Cart item calculation information

Field*	Type	Description
unitPrice	Integer	Single item price without assuming is it net or gross. This value should be used everywhere a price is disabled. It allows switching the tax mode without side effects.
sumPrice	Integer	Sum of all items prices calculated.
taxRate	Integer	Current tax rate in per cent.
unitNetPrice	Integer	Single item net price.
sumNetPrice	Integer	Sum of all items’ net price.
unitGrossPrice	Integer	Single item gross price.
sumGrossPrice	Integer	Sum of items gross price.
unitTaxAmountFullAggregation	Integer	Total tax amount for a given item with additions.
sumTaxAmountFullAggregation	Integer	Total tax amount for a given amount of items with additions.
sumSubtotalAggregation	Integer	Sum of subtotals of the items.
unitSubtotalAggregation	Integer	Subtotal for the given item.
unitProductOptionPriceAggregation	Integer	Item total product option price.
sumProductOptionPriceAggregation	Integer	Item total of product options for the given sum of items.
unitDiscountAmountAggregation	Integer	Item total discount amount.
sumDiscountAmountAggregation	Integer	Sum Item total discount amount.
unitDiscountAmountFullAggregation	Integer	Sum total discount amount with additions.
sumDiscountAmountFullAggregation	Integer	Item total discount amount with additions.
unitPriceToPayAggregation	Integer	Item total price to pay after discounts with additions.
sumPriceToPayAggregation	Integer	Sum of the prices to pay (after discounts).
*The fields mentioned are all attributes in the response. Type and ID are not mentioned.

Possible Errors

Code	Reason
101	A cart with the specified ID was not found.
104	Cart ID missing.
109	Anonymous customer ID is missing.

Adding Items to Guest Carts

To add items to guest carts, send a POST request to one of the following endpoints:

reference guest cart by guest user ID

The user's unique identifier is passed in the **X-Anonymous-Customer-Unique-Id** header when creating a cart. It is managed by the API client.

`/guest-cart-items` Request sample: `GET http://mysprykershop.com/guest-cart-items` **Headers:** **X-Anonymous-Customer-Unique-Id** - specifies the unique guest user ID.

by the unique identifier of the cart

The unique identifier of the cart is passed by the Glue API in the id attribute of a **RestCartsResponse** when a new guest cart is created.

`/guest-carts/{{guestCartId}}` Request sample: `POST http://mysprykershop.com/guest-carts/2506b65c-164b-5708-8530-94ed7082e802/guest-cart-items` where `2506b65c-164b-5708-8530-94ed7082e802` is the ID of the cart you need.

Request

Attributes:

Attribute	Type	Required	Description
sku	String	✓	Specifies the SKU part number of an item to add to the cart.
quantity	String	✓	Specifies the quantity of items to add.

Sample Request Body

{
	"data": {
		"type": "guest-cart-items",
		"attributes": {
			"sku": "209_12554247",
			"quantity": 10
		}
	}
}

Response

In case of a successful update, the endpoint will also respond with a RestCartsResponse containing the new items.

Possible Errors

Code	Reason
101	A cart with the specified ID was not found.
102	Failed to add an item.
104	Cart ID missing.
109	Anonymous customer ID is empty.

Removing Items from Guest Carts

To remove an item from a guest cart, send a DELETE request to one of the following endpoints:

/guest-carts/{{guestCartId}}/guest-cart-items/{{concrete_product_sku}}

Request sample: DELETE http://mysprykershop.com/guest-carts/2506b65c-164b-5708-8530-94ed7082e802/guest-cart-items/177_25913296

where 2506b65c-164b-5708-8530-94ed7082e802 is the ID of the cart you need and 177_25913296 is the SKU of the concrete product you want to remove.

Headers: X-Anonymous-Customer-Unique-Id - specifies the unique guest user ID.

The unique identifier of the cart is passed by the Glue API in the id attribute of a **RestCartsResponse** when a new guest cart is created.

The user's unique identifier is passed in the **X-Anonymous-Customer-Unique-Id** header when creating a cart. It is managed by the API client.

Response

If the item was deleted successfully, the endpoint will respond with a 204 No Content status code.

Possible Errors

Code	Reason
101	A cart with the specified ID was not found.
103	Item could not be found in the cart.
104	Cart ID missing.
106	Failed to delete an item.
109	Anonymous customer ID is empty.

Changing Item Quantity in a Guest Cart

To change the quantity of certain items in a guest cart, use the following endpoints with the PATCH method:

/guest-carts/{{guestCartId}}/guest-cart-items/{{concrete_product_sku}} Request sample: PATCH http://mysprykershop.com/guest-carts/2506b65c-164b-5708-8530-94ed7082e802/guest-cart-items/177_25913296 where 2506b65c-164b-5708-8530-94ed7082e802 is the ID of the cart you need and 177_25913296 is the SKU the concrete product for which to change the quantity.

Headers: X-Anonymous-Customer-Unique-Id - specifies the unique guest user ID.

The unique identifier of the cart is passed by the Glue API in the id attribute of a **RestCartsResponse** when a new guest cart is created.

The user's unique identifier is passed in the **X-Anonymous-Customer-Unique-Id** header when creating a cart. It is managed by the API client.

Request

Attributes:

Attribute	Type	Required	Description
sku	String	✓	Specifies the SKU part number of an item to add to the cart.
quantity	String	✓	Specifies the quantity of items to add.

Sample Request Body

{
	"data": {
		"type": "guest-cart-items",
		"attributes": {
			"sku": "209_12554247",
			"quantity": 10
		}
	}
}

Response

In case of a successful update, the endpoint will also respond with a RestCartsResponse with updated quantity.

Possible Errors

Code	Reason
101	A cart with the specified ID was not found.
102	Failed to update the item.
103	Item could not be found in the cart.
104	Cart ID missing.
109	Anonymous customer ID is empty.

Assigning Guest Cart to a Registered Customer

Initially, guest carts are anonymous. In other words, they are not related to any particular user. However, if an anonymous customer authenticates or registers in the system, you can link their guest cart with their user account, so that they don’t lose the list of products they want to purchase. For this purpose, you need to transform a guest cart into a registered user cart.

To assign a guest cart to a new customer, send a request to create a customer and pass the X-Anonymous-Customer-Unique-Id header as a part of your request. To assign a cart to an already registered customer who wants to log in, include the X-Anonymous-Customer-Unique-Id header in the authentication request.

The user's unique identifier is passed in the **X-Anonymous-Customer-Unique-Id** header when creating a cart. It is managed by the API client.

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