Discount migrations (#2768)

* [Discounts] Added migration doc

* Added files

* Update docs/content_management/data_migration/importing_data.md

Author: mnocon

code_samples/data_migration/examples/discounts/discount_create.yaml

@@ -0,0 +1,37 @@
+-   type: discount
+    mode: create
+    identifier: summer_sale_2025
+    translations:
+        -
+            language_code: eng-GB
+            name: "Summer Sale 2025"
+            description: "-10% on laptops"
+            label: "HOT DEAL: Summer Sale!"
+            label_description: "Get 10% off on selected items!"
+    discount_type: cart
+    priority: 8
+    enabled: true
+    user: admin
+    startDate: '2024-01-01T00:01:00+00:00'
+    endDate: null
+    createdAt: null
+    updatedAt: null
+    rule:
+        type: percentage
+        expressionValues:
+            discount_percentage: 10
+    conditions:
+        -   
+            identifier: is_in_currency
+            expressionValues: 
+                currency_code: EUR
+        -
+            identifier: is_product_in_array
+            expressionValues:
+                product_codes: 
+                    - product_code_book_0
+                    - product_code_book_1
+        -
+            identifier: is_product_in_quantity_in_cart
+            expressionValues:
+                quantity: 2

code_samples/data_migration/examples/discounts/discount_update.yaml

@@ -0,0 +1,29 @@
+-   type: discount
+    mode: update
+    match:
+        field: identifier
+        value: summer_sale_2025
+    identifier: summer_sale_2025_updated
+    translations:
+        eng-GB:
+            language_code: eng-GB
+            name: Updated name
+            description: Updated description
+            label: Updated promotion label
+            label_description: Updated promotion description
+    priority: 5
+    active: true
+    user: admin
+    startDate: '2024-01-01T00:00:00+00:00'
+    endDate: null
+    createdAt: null
+    updatedAt: null
+    rule:
+        type: percentage
+        expressionValues:
+            discount_percentage: '10'
+    conditions:
+        -
+            identifier: is_product_in_quantity_in_cart
+            expressionValues:
+                quantity: 2

docs/content_management/data_migration/importing_data.md

@@ -507,6 +507,21 @@ When updating a content type, use:
 [[= include_file('code_samples/data_migration/examples/ai/action_configuration_delete.yaml') =]]
 ```
 
+### Discounts [[% include 'snippets/lts-update_badge.md' %]]
+
+- The following example shows how you can create a new [discount](discounts_guide.md) in your system:
+
+``` yaml
+[[= include_file('code_samples/data_migration/examples/discounts/discount_create.yaml') =]]
+```
+
+- Use the `update` mode to modify an existing discount as in the example below.
+The provided conditions overwrite any already existing ones.
+
+``` yaml
+[[= include_file('code_samples/data_migration/examples/discounts/discount_update.yaml') =]]
+```
+
 ## Criteria
 
 When using `update` or `delete` modes, you can use criteria to identify the objects to operate on.