[feat] Pay to enable extension (#2516)

* feat: add payment tab

* feat: add buttons

* feat: persist `pay to enable` changes

* fix: do not disable extension on upgrade

* fix: show releases tab first

* feat: extract `enableExtension` logic

* refactor: rename routes

* feat: show dialog for paying extension

* feat: create invoice to enable

* refactor: extract enable/disable extension logic

* feat: add extra info to UserExtensions

* feat: check payment for extension enable

* fix: parsing

* feat: admins must not pay

* fix: code checks

* fix: test

* refactor: extract extension activate/deactivate to the `api` side

* feat: add `get_user_extensions `

* feat: return explicit `requiresPayment`

* feat: add `isPaymentRequired` to extension list

* fix: `paid_to_enable` status

* fix: ui layout

* feat: show QR Code

* feat: wait for invoice to be paid

* test: removed deprecated test and dead code

* feat: add re-check button

* refactor: rename paths for endpoints

* feat: i18n

* feat: add `{"success": True}`

* test: fix listener

* fix: rebase errors

* chore: update bundle

* fix: return error status code for the HTML error pages

* fix: active extension loading from file system

* chore: temp commit

* fix: premature optimisation

* chore: make check

* refactor: remove extracted logic

* chore: code format

* fix: enable by default after install

* fix: use `discard` instead of `remove` for `set`

* chore: code format

* fix: better error code

* fix: check for stop function before invoking

* feat: check if the wallet belongs to the admin user

* refactor: return 402 Requires Payment

* chore: more typing

* chore: temp checkout different branch for tests

* fix: too much typing

* fix: remove try-except

* fix: typo

* fix: manual format

* fix: merge issue

* remove this line

---------

Co-authored-by: dni ⚡ <office@dnilabs.com>

lnbits/core/helpers.py

@@ -77,7 +77,9 @@ async def _stop_extension_background_work(ext_id) -> bool:
         stop_fn_name = next((fn for fn in stop_fns if hasattr(old_module, fn)), None)
         assert stop_fn_name, "No stop function found for '{ext.module_name}'"
 
-        await getattr(old_module, stop_fn_name)()
+        stop_fn = getattr(old_module, stop_fn_name)
+        if stop_fn:
+            await stop_fn()
 
         logger.info(f"Stopped background work for extension '{ext.module_name}'.")
     except Exception as ex: