I'm building a customer billing portal, what tools should I look at?

For a customer billing portal, I’d look at tools in a few layers:

1) Payments + subscriptions

• Stripe — the default choice for many SaaS products; subscriptions, invoices, coupons, proration, customer portal, tax support.
• Paddle — good if you want a more “merchant of record” setup that handles taxes/VAT and compliance for you.
• Braintree / Adyen / Checkout.com — worth considering for larger or more global payment setups.

2) Billing/invoicing automation

• Stripe Billing or Chargebee — for recurring billing, invoicing, dunning, upgrades/downgrades, and entitlement management.
• Recurly — another strong subscription billing option.
• Zoho Invoice / QuickBooks / Xero — if you need accounting integration or simpler invoicing workflows.

3) Customer portal UI

• Stripe Customer Portal — fast to launch if you’re using Stripe and want customers to manage cards, invoices, and plans.
• Chargebee hosted portal — more flexible subscription management portal.
• Custom frontend — if you need tight control over UX, you can build your own portal and connect it to billing APIs.

4) Authentication / user management

• Auth0, Clerk, Firebase Auth, Supabase Auth — for login, identity, SSO, and org/user management.
• If you already have auth, make sure the portal can map users to billing accounts cleanly.

5) In-app support and communication

• Intercom, Zendesk, Crisp, Help Scout — for billing support, self-serve help, and payment issue workflows.
• SendGrid, Postmark, Mailgun — for billing emails like receipts, reminders, and failed payment notifications.

6) Tax and compliance

• Stripe Tax, TaxJar, Avalara — for sales tax/VAT/GST calculation and reporting.
• If you handle card data yourself, you’ll need to think about PCI compliance, so using hosted payment flows reduces scope.

7) Analytics and event tracking

• Segment, Mixpanel, Amplitude, PostHog — useful to track billing funnel events, churn, conversion, failed payments, and portal usage.

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Good “starter stacks”

Fastest to launch

• Stripe Billing + Stripe Customer Portal + Auth0/Clerk + SendGrid
  • Best if you want something reliable and quick.

More complete SaaS billing

• Stripe or Chargebee + custom portal + Stripe Tax + Postmark + Intercom
  • Good if you want a branded portal and stronger operational tooling.

Global tax/compliance-heavy

• Paddle + hosted portal + support tool + accounting integration
  • Best if you want less burden from VAT/sales tax complexity.

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How to choose

Ask:

1. Do you need subscriptions, invoices, or one-time payments?
2. Do you need a hosted portal or a custom UX?
3. Are you selling globally and handling tax/VAT?
4. Do you need dunning, retries, and proration?
5. Do you want the payment provider to be merchant of record?

If you tell me:

• your business model (SaaS, marketplace, services, etc.)
• countries you sell in
• whether you need subscriptions
• your current stack

…I can recommend a more specific toolset and architecture.