Feat: Updating Shipping Method with new variables, for correct box env vars

config/shippingCarriers/boxnow.php

@@ -13,12 +13,25 @@
 |
 | Set these via environment variables — never commit real values.
 |
+| Box Now has two environments (see their Partner API manual, section 2):
+| Stage/Sandbox for testing, Production once live. Each has its own
+| client_id/client_secret pair and its own base_url/location_api_url —
+| there is no shared "switch an env var" flag, since stage credentials
+| don't work against the production host or vice versa.
+|
 | BOXNOW_BASE_URL         Root REST endpoint for delivery-requests/parcels.
 | BOXNOW_LOCATION_API_URL Separate, faster endpoint for origins/destinations
 |                         lookups (Box Now recommends this over the main
 |                         base URL for those two calls specifically).
 | BOXNOW_CLIENT_ID        OAuth2 client id.
 | BOXNOW_CLIENT_SECRET    OAuth2 client secret.
+| BOXNOW_PARTNER_ID       Numeric partnerId Box Now issues alongside your
+|                         credentials. NOT used for REST API authentication
+|                         (BoxNowClient authenticates with client_id/
+|                         client_secret alone) — this is only consumed by
+|                         the client-side Destination Map widget config
+|                         (_bn_map_widget_config.partnerId), confirmed
+|                         against Box Now's own WooCommerce plugin source.
 | BOXNOW_ORIGIN_LOCATION_ID  Your warehouse's Box Now locationId, used as
 |                            the pickup origin on every delivery request.
 | BOXNOW_SENDER_*         Static sender contact details reused on every
@@ -33,6 +46,7 @@ return [
 
     'client_id' => env('BOXNOW_CLIENT_ID'),
     'client_secret' => env('BOXNOW_CLIENT_SECRET'),
+    'partner_id' => env('BOXNOW_PARTNER_ID'),
 
     'origin_location_id' => env('BOXNOW_ORIGIN_LOCATION_ID'),