CCSAAS-4856 - Add customer JSON import - ACCS

src/pages/rest/modules/import/index.md

@@ -48,6 +48,33 @@ The `import/json` endpoint is designed for JSON data:
 *  Convert your CSV into JSON using any trustworthy online converter.
 *  When converting CSV to JSON using standard tools or libraries, special characters within the data are typically escaped automatically. Ensure that any manual edits or custom conversion processes handle this escaping appropriately.
 
+#### Customer imports in Adobe Commerce as a Cloud Service
+
+In Adobe Commerce as a Cloud Service, the `POST /V1/import/json` endpoint does not support the `assistance_allowed` field when the `entity` field is set to `customer`. However, you can create or modify customers that have [remote shopping assistance enabled](https://experienceleague.adobe.com/en/docs/commerce-admin/customers/customer-accounts/manage/login-as-customer#customer-account-permission-for-remote-shopping-assistance) by using the following methods:
+
+* Use `POST /V1/async/bulk/customers` to bulk create customers with `assistance_allowed` pre-enabled.
+
+   ```json
+    {
+    "customer": {
+        "email": "user@example.com",
+        "firstname": "User",
+        "lastname": "Name",
+        "website_id": 1,
+        "extension_attributes": {
+        "assistance_allowed": 2
+        }
+    },
+    "password": "Password123!"
+    }
+   ```
+
+* Use the `PUT /V1/customers/{id}` endpoint to modify existing customers individually.
+
+   ```json
+   {"customer": {"extension_attributes": {"assistance_allowed": 2}}}
+   ```
+
 ### Validation Strategy
 
 A validation strategy is mandatory. Depending on your chosen strategy, the API will either proceed with the import or abort it upon encountering invalid rows.