Update api spec (#1385)

YOYO NEW API SPEC!

Co-authored-by: zoo-github-actions-auth[bot] <zoo-github-actions-auth[bot]@users.noreply.github.com>

Author: zoo-github-actions-auth[bot]

spec.json

@@ -27836,6 +27836,16 @@
             "default": false,
             "type": "boolean"
           },
+          "billing_reason": {
+            "nullable": true,
+            "description": "Why this invoice was created (e.g. `subscription_cycle`).",
+            "type": "string"
+          },
+          "collection_method": {
+            "nullable": true,
+            "description": "Invoice collection method as returned by Stripe.",
+            "type": "string"
+          },
           "created_at": {
             "description": "Time at which the object was created.",
             "type": "string",
@@ -27925,6 +27935,11 @@
               }
             ]
           },
+          "subscription_id": {
+            "nullable": true,
+            "description": "Subscription ID tied to this invoice, when available.",
+            "type": "string"
+          },
           "subtotal": {
             "title": "double",
             "description": "Total of all subscriptions, invoice items, and prorations on the invoice before any invoice level discount or tax is applied.\n\nItem discounts are already incorporated.",
@@ -43942,13 +43957,6 @@
               "modeling_app"
             ]
           },
-          {
-            "description": "The Diff Chrome Extension.",
-            "type": "string",
-            "enum": [
-              "diff_chrome_extension"
-            ]
-          },
           {
             "description": "The Text-to-CAD UI.",
             "type": "string",