Implement new billing-gateway and update related services

Created a new package named billing-gateway which implements interfaces for different billing providers and provides a centralized service for payments. This will potentially help to maintain cleaner code by reducing direct dependencies on specific payment providers in the core application code. Additionally, made adjustments in existing services, like Stripe, to comply with this change. The relevant interfaces and types have been exported and imported accordingly.

apps/web/app/join/page.tsx

@@ -3,19 +3,20 @@ import { notFound } from 'next/navigation';
 
 import type { SupabaseClient } from '@supabase/supabase-js';
 
-import ExistingUserInviteForm from '~/join/_components/ExistingUserInviteForm';
-import NewUserInviteForm from '~/join/_components/NewUserInviteForm';
-import { withI18n } from '~/lib/i18n/with-i18n';
-
 import { Logger } from '@kit/shared/logger';
+import { Database } from '@kit/supabase/database';
 import { getSupabaseServerComponentClient } from '@kit/supabase/server-component-client';
 import { Heading } from '@kit/ui/heading';
 import { If } from '@kit/ui/if';
 import { Trans } from '@kit/ui/trans';
 
+import ExistingUserInviteForm from '~/join/_components/ExistingUserInviteForm';
+import NewUserInviteForm from '~/join/_components/NewUserInviteForm';
+import { withI18n } from '~/lib/i18n/with-i18n';
+
 interface Context {
-  params: {
-    code: string;
+  searchParams: {
+    invite_token: string;
   };
 }
 
@@ -23,9 +24,9 @@ export const metadata = {
   title: `Join Organization`,
 };
 
-async function InvitePage({ params }: Context) {
-  const code = params.code;
-  const data = await loadInviteData(code);
+async function JoinTeamAccountPage({ searchParams }: Context) {
+  const token = searchParams.invite_token;
+  const data = await getInviteDataFromInviteToken(token);
 
   if (!data.membership) {
     notFound();
@@ -62,16 +63,19 @@ async function InvitePage({ params }: Context) {
         </p>
       </div>
 
-      <If condition={data.session} fallback={<NewUserInviteForm code={code} />}>
-        {(session) => <ExistingUserInviteForm code={code} session={session} />}
+      <If
+        condition={data.session}
+        fallback={<NewUserInviteForm code={token} />}
+      >
+        {(session) => <ExistingUserInviteForm code={token} session={session} />}
       </If>
     </>
   );
 }
 
-export default withI18n(InvitePage);
+export default withI18n(JoinTeamAccountPage);
 
-async function loadInviteData(code: string) {
+async function getInviteDataFromInviteToken(code: string) {
   const client = getSupabaseServerComponentClient();
 
   // we use an admin client to be able to read the pending membership