chore(docs): Updated API Reference (v2) (#8609)

Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action

Co-authored-by: Shahed Nasser <27354907+shahednasser@users.noreply.github.com>

www/apps/api-reference/specs/admin/components/schemas/BaseApplicationMethod.yaml

@@ -0,0 +1,58 @@
+type: object
+description: The promotion's application method.
+x-schemaName: BaseApplicationMethod
+required:
+  - id
+properties:
+  id:
+    type: string
+    title: id
+    description: The application method's ID.
+  type:
+    type: string
+    enum:
+      - fixed
+      - percentage
+  target_type:
+    type: string
+    enum:
+      - items
+      - shipping_methods
+      - order
+  allocation:
+    type: string
+    enum:
+      - each
+      - across
+  value:
+    type: number
+    title: value
+    description: The application method's value.
+  currency_code:
+    type: string
+    title: currency_code
+    description: The application method's currency code.
+  max_quantity:
+    type: number
+    title: max_quantity
+    description: The application method's max quantity.
+  buy_rules_min_quantity:
+    type: number
+    title: buy_rules_min_quantity
+    description: The application method's buy rules min quantity.
+  apply_to_quantity:
+    type: number
+    title: apply_to_quantity
+    description: The application method's apply to quantity.
+  promotion:
+    $ref: ./BasePromotion.yaml
+  target_rules:
+    type: array
+    description: The application method's target rules.
+    items:
+      $ref: ./BasePromotionRule.yaml
+  buy_rules:
+    type: array
+    description: The application method's buy rules.
+    items:
+      $ref: ./BasePromotionRule.yaml