AC-16808: Document the new Free Gift cart price rule action type

src/pages/config.md

@@ -229,6 +229,7 @@
                 - [removeItemFromCart](/graphql/schema/cart/mutations/remove-item.md)
                 - [removeRewardPointsFromCart](/graphql/schema/cart/mutations/remove-reward-points.md)
                 - [removeStoreCreditFromCart](/graphql/schema/cart/mutations/remove-store-credit.md)
+                - [selectFreeGiftForCart](/graphql/schema/cart/mutations/select-free-gift.md)
                 - [setBillingAddressOnCart](/graphql/schema/cart/mutations/set-billing-address.md)
                 - [setGiftOptionsOnCart](/graphql/schema/cart/mutations/set-gift-options.md)
                 - [setGuestEmailOnCart](/graphql/schema/cart/mutations/set-guest-email.md)

src/pages/graphql/schema/cart/mutations/index.md

@@ -23,6 +23,7 @@ The cart mutations allow you to perform the following operations:
   * [`clearCart`](clear-cart.md)
   * [`addVirtualProductsToCart`](add-virtual-products.md)
   * [`removeItemFromCart`](remove-item.md)
+  * [`selectFreeGiftForCart`](select-free-gift.md)
   * [`setGiftOptionsOnCart`](set-gift-options.md)
   * [`updateCartItems`](update-items.md)
 

src/pages/graphql/schema/cart/mutations/select-free-gift.md

@@ -0,0 +1,253 @@
+---
+title: selectFreeGiftForCart mutation
+description: The selectFreeGiftForCart mutation defines the product that a shopper has selected as a free gift.
+---
+
+# selectFreeGiftForCart mutation
+
+<InlineAlert variant="info" slots="text1" />
+This mutation is part of the Storefront Compatibility Package and is only available on [Adobe Commerce as a Cloud Service](https://experienceleague.adobe.com/en/docs/commerce/cloud-service/overview).
+
+The `selectFreeGiftForCart` mutation defines the product that a shopper has selected as a free gift. This mutation is applicable only when a Free Gift cart price rule has been applied to the cart and the rule requires the shopper to choose a gift SKU before placing the order.
+
+Some Free Gift rules add a gift to the cart automatically. Other rules offer multiple SKUs, or a product with configurable or bundle options, and require the shopper to make a selection. Use the following [`Cart`](../queries/cart.md) fields to determine whether a selection is needed and which products are eligible:
+
+*  `has_available_free_gifts` is `true` when at least one applied Free Gift rule is still waiting for the shopper to select a SKU.
+*  `available_free_gifts` lists each rule that requires a selection, along with its `rule_id`, `gift_qty`, `available_skus`, and the corresponding `products`.
+
+After the shopper selects a gift, the mutation adds the product to the cart as a free-gift line item. Line items added by a Free Gift rule return `true` for the `is_free_gift` field on the [`CartItemInterface`](../interfaces/index.md). After the order is placed, the corresponding order item returns the rule label in the `free_gift_label` field on the `OrderItemInterface`.
+
+## Syntax
+
+`mutation: {selectFreeGiftForCart(input: SelectFreeGiftForCartInput!): SelectFreeGiftForCartOutput}`
+
+## Example usage
+
+### Determine which free gifts require a selection
+
+The following query returns the Free Gift rules that are applied to the cart but still need the shopper to choose a gift SKU.
+
+**Request:**
+
+```graphql
+{
+  cart(cart_id: "8k0Q4MpH2IGahWrTRtqM61YV2MtLPApz") {
+    has_available_free_gifts
+    available_free_gifts {
+      rule_id
+      rule_label
+      gift_qty
+      available_skus
+      products {
+        sku
+        name
+      }
+    }
+  }
+}
+```
+
+**Response:**
+
+```json
+{
+  "data": {
+    "cart": {
+      "has_available_free_gifts": true,
+      "available_free_gifts": [
+        {
+          "rule_id": 5,
+          "rule_label": "Free gift with orders over $50",
+          "gift_qty": 1,
+          "available_skus": [
+            "24-MB01",
+            "24-MB04"
+          ],
+          "products": [
+            {
+              "sku": "24-MB01",
+              "name": "Joust Duffle Bag"
+            },
+            {
+              "sku": "24-MB04",
+              "name": "Strive Shoulder Pack"
+            }
+          ]
+        }
+      ]
+    }
+  }
+}
+```
+
+### Select a free gift
+
+The following example selects the `24-MB01` gift product for rule `5` and adds it to the cart. The response confirms that the item was added as a free gift.
+
+**Request:**
+
+```graphql
+mutation {
+  selectFreeGiftForCart(
+    input: {
+      cart_id: "8k0Q4MpH2IGahWrTRtqM61YV2MtLPApz"
+      rule_id: 5
+      sku: "24-MB01"
+      quantity: 1
+    }
+  ) {
+    cart {
+      has_available_free_gifts
+      itemsV2 {
+        items {
+          uid
+          quantity
+          is_free_gift
+          product {
+            sku
+            name
+          }
+          prices {
+            price {
+              value
+              currency
+            }
+          }
+        }
+        total_count
+        page_info {
+          page_size
+          current_page
+          total_pages
+        }
+      }
+    }
+  }
+}
+```
+
+**Response:**
+
+```json
+{
+  "data": {
+    "selectFreeGiftForCart": {
+      "cart": {
+        "has_available_free_gifts": false,
+        "itemsV2": {
+          "items": [
+            {
+              "uid": "Mg==",
+              "quantity": 1,
+              "is_free_gift": false,
+              "product": {
+                "sku": "24-WB05",
+                "name": "Savvy Shoulder Tote"
+              },
+              "prices": {
+                "price": {
+                  "value": 32,
+                  "currency": "USD"
+                }
+              }
+            },
+            {
+              "uid": "Mjc=",
+              "quantity": 1,
+              "is_free_gift": true,
+              "product": {
+                "sku": "24-MB01",
+                "name": "Joust Duffle Bag"
+              },
+              "prices": {
+                "price": {
+                  "value": 0,
+                  "currency": "USD"
+                }
+              }
+            }
+          ],
+          "total_count": 2,
+          "page_info": {
+            "page_size": 20,
+            "current_page": 1,
+            "total_pages": 1
+          }
+        }
+      }
+    }
+  }
+}
+```
+
+### Select a gift with product options
+
+If the gift SKU is a configurable or bundle product, provide the `selected_options` (and, when applicable, `entered_options`) values, in the same way you would when calling the [`addProductsToCart` mutation](add-products.md).
+
+```graphql
+mutation {
+  selectFreeGiftForCart(
+    input: {
+      cart_id: "8k0Q4MpH2IGahWrTRtqM61YV2MtLPApz"
+      rule_id: 5
+      sku: "WSH12"
+      quantity: 1
+      selected_options: [
+        "Y29uZmlndXJhYmxlLzkzLzUz"
+        "Y29uZmlndXJhYmxlLzE2MS8xNzQ="
+      ]
+    }
+  ) {
+    cart {
+      itemsV2 {
+        items {
+          uid
+          is_free_gift
+          product {
+            sku
+            name
+          }
+        }
+        total_count
+      }
+    }
+  }
+}
+```
+
+## Input attributes
+
+The `SelectFreeGiftForCartInput` object must contain the following attributes.
+
+| Attribute | Data Type | Description |
+| --- | --- | --- |
+| `cart_id` | String! | The masked ID of the shopper's cart. |
+| `rule_id` | Int! | The identifier of the Free Gift rule the selection is for. Must be a rule that is currently applied to the cart and pending selection. |
+| `sku` | String! | The SKU of the gift product to add. Must be one of the rule's configured SKUs. |
+| `quantity` | Int | Overrides the rule's configured gift quantity. Must be a positive integer no greater than the rule's `gift_qty`. Defaults to the rule's `gift_qty`. |
+| `entered_options` | [[EnteredOptionInput!]](../../products/interfaces/index.md) | An array of custom option values entered by the shopper, such as text inputs. |
+| `selected_options` | [ID!] | An array of UIDs that identify selected option values, such as configurable variants or bundle selections. |
+
+## Output attributes
+
+The `SelectFreeGiftForCartOutput` object contains the `Cart` object.
+
+| Attribute | Data Type | Description |
+| --- | --- | --- |
+| `cart` | [Cart!](../queries/cart.md) | The cart after adding the selected free-gift product. |
+
+## Errors
+
+| Error | Description |
+| --- | --- |
+| `Could not find a cart with ID "XXX"` | The specified `cart_id` value does not exist in the `quote_id_mask` table. |
+| `Required parameter "cart_id" is missing` | The mutation does not contain a `cart_id` argument. |
+| `The rule ID "XXX" is not currently pending a free gift selection for this cart.` | The specified `rule_id` is not applied to the cart, or it does not require a gift selection. |
+| `The SKU "XXX" is not a valid free gift for rule ID "YYY".` | The specified `sku` is not one of the SKUs configured on the rule. |
+| `The requested quantity exceeds the free gift quantity allowed by the rule.` | The specified `quantity` is greater than the rule's `gift_qty`. |
+
+## Related topics
+
+*  [cart query](../queries/cart.md)
+*  [addProductsToCart mutation](add-products.md)
+*  [CartItemInterface attributes and implementations](../interfaces/index.md)