More Shipstation integrations(warehouses)

app/services/shipstation_send.py

@@ -10,7 +10,11 @@ still have an option for CSV uploads"):
     row per line item, customer/address info repeated on each row.
   - send_order_to_shipstation_api(): calls ShipStation's V2 API
     directly (POST /v2/shipments with create_sales_order: true) to
-    create the order without leaving the app.
+    create the order without leaving the app. Needs a Warehouse ID per
+    company (SHIPSTATION_SIGNIFY_WAREHOUSE_ID /
+    SHIPSTATION_OAKSTREET_WAREHOUSE_ID) - ShipStation requires knowing
+    where the package ships FROM, either via a warehouse or an explicit
+    ship_from address; only the warehouse path is wired up today.
 
 IMPORTANT - please verify the first real send: ShipStation's docs say
 automation rules apply tags to orders "when they import based on any
@@ -134,6 +138,15 @@ def _store_id_for_company(company: str) -> str:
     return ""
 
 
+def _warehouse_id_for_company(company: str) -> str:
+    settings = config.load_settings()
+    if company == "Signify Health":
+        return settings.get("SHIPSTATION_SIGNIFY_WAREHOUSE_ID", "")
+    if company == "Oak Street Health":
+        return settings.get("SHIPSTATION_OAKSTREET_WAREHOUSE_ID", "")
+    return ""
+
+
 def send_order_to_shipstation_api(order: Order) -> dict:
     """
     Creates the order directly in ShipStation via POST /v2/shipments with
@@ -154,6 +167,19 @@ def send_order_to_shipstation_api(order: Order) -> dict:
             "Add it in Settings under ShipStation."
         )
 
+    # ShipStation needs to know where the package ships FROM - either a
+    # configured warehouse, or an explicit ship_from address. Only the
+    # warehouse path is wired up today; fail clearly here rather than
+    # sending an incomplete request and getting ShipStation's less
+    # actionable "ship_from is required when warehouse_id is not present".
+    warehouse_id = _warehouse_id_for_company(order.company)
+    if not warehouse_id:
+        raise ShipStationSendError(
+            f"No ShipStation Warehouse ID configured for '{order.company}'. "
+            "Add it in Settings under ShipStation - find it in ShipStation under "
+            "Settings > Shipping > Warehouses/Ship From Locations."
+        )
+
     info = order.shipping_info or {}
     if not (info.get("address1") and info.get("city") and info.get("state") and info.get("zip")):
         raise ShipStationSendError(
@@ -172,6 +198,7 @@ def send_order_to_shipstation_api(order: Order) -> dict:
             {
                 "create_sales_order": True,
                 "store_id": store_id,
+                "warehouse_id": warehouse_id,
                 "external_shipment_id": ticket_number,
                 "shipment_number": ticket_number,
                 "ship_to": {