- Add createPortalSession endpoint to koha.controller.js
- Add POST /api/koha/portal route with rate limiting
- Add 'Manage Your Subscription' section to koha.html
- Implement handleManageSubscription() in koha-donation.js
- Add Koha link to navigation menu in navbar.js
- Allow donors to self-manage subscriptions via Stripe portal
- Portal supports: payment method updates, cancellation, invoice history
Ref: Customer Portal setup docs in docs/STRIPE_CUSTOMER_PORTAL_NEXT_STEPS.md
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Co-Authored-By: Claude <noreply@anthropic.com>
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