Subscription Billing Infrastructure Checklist for SaaS Teams

Subscription billing needs to keep payments, invoices, and access permissions in sync through renewals, failures, and plan changes. Use this checklist to review those paths and record gaps before adding new billing options.

Core Payment Processing

• Payment method storage: Card data is tokenized through your payment provider. You never touch raw card numbers.
• Multiple payment methods per customer: Customers can add a backup card and designate a default.
• Account Updater enabled: Your payment processor automatically refreshes expired or reissued card details with Visa and Mastercard networks.
• SCA compliance: Strong Customer Authentication (3DS2) flows are implemented for European customers where required.
• Currency support: If you serve international customers, you have mapped which currencies you accept and how exchange rates are handled.

Subscription Lifecycle Management

• Plan creation and retrieval: Plans are defined in your billing provider and referenced by ID — not hardcoded prices in application code.
• Subscription creation: Customer and subscription creation use persisted operation state, idempotency, and reconciliation so partial failures can be recovered.
• Trial periods: If you offer trials, the trial end date is stored and the transition to paid is handled automatically by your billing provider.
• Upgrade and downgrade paths: Mid-cycle plan changes calculate proration correctly. Downgrade credits are applied to the next invoice, not discarded.
• Cancellation flows: Customers can cancel via self-service. Cancellations are set to cancel_at_period_end by default, not immediate termination.
• Reactivation: Customers who cancelled during the grace period can reactivate without re-entering payment details.

Webhook Handling

• Signature verification: Every incoming webhook is verified using your provider's signature header. Unverified requests are rejected.
• Idempotent handlers: Webhook handlers are idempotent — processing the same event twice does not create duplicate records or charges.
• Event logging: Received webhook events have a recorded identifier and processing status, with payload access and retention limited to operational needs.
• Dead-letter handling: Webhook events that fail processing are queued for retry or flagged for manual review. Silently dropping failed events is not acceptable.
• Critical events handled: At minimum, your system handles invoice.payment_failed, invoice.payment_succeeded, customer.subscription.deleted, and customer.subscription.updated.

Dunning and Revenue Recovery

• Automated payment retry: Failed payments are retried on a smart schedule — not a fixed 24-hour interval. Retry logic accounts for failure code type.
• Pre-expiry notifications: Customers with cards expiring in the next 30 days receive an automated reminder.
• Dunning email sequence: A multi-step notification sequence fires after a payment failure, escalating over 7 to 14 days.
• Self-service payment update: Every dunning notification links directly to an authenticated card update page. No login navigation required.
• Grace period policy: Access is not suspended immediately on payment failure. The grace period length is defined, documented, and communicated to customers.
• Recovery rate tracking: You measure what percentage of failed payments are ultimately recovered, segmented by failure type.

Invoicing and Revenue Recognition

• Invoice generation: Invoices are generated automatically at each billing period. Customers can access past invoices from their account.
• Invoice line items: Each invoice clearly itemizes what is being charged — plan name, period, any prorations, and applicable taxes.
• Tax handling: Sales tax or VAT is calculated and applied correctly by jurisdiction. You are not applying a flat rate to all customers.
• Manual invoicing: You have a path to issue a custom one-off invoice for enterprise deals or professional services without disrupting the subscription cycle.
• Credit notes: When issuing refunds or prorated credits, a credit note is generated against the original invoice for accounting integrity.

Metered and Usage-Based Billing (If Applicable)

• Usage event pipeline: Usage events are captured server-side, timestamped in UTC, and delivered to your billing provider reliably.
• Aggregation and deduplication: High-volume usage is aggregated before reporting to avoid rate limits. Duplicate events are detected and suppressed.
• Customer usage dashboard: Customers can see their current period usage and projected cost before the invoice is finalized.
• Usage alerts: Customers can set thresholds that trigger a notification when usage approaches a defined limit.
• Reconciliation: Actual usage logged in your system is reconciled against what your billing provider invoiced. This runs automatically on a regular schedule.

Reporting and Analytics

• MRR tracking: Monthly recurring revenue is calculated from active subscription data, not from payment volume. Proration charges are excluded from MRR.
• Churn reporting: Voluntary and involuntary churn are tracked separately. Involuntary churn shows you dunning performance.
• Cohort retention: You can see what percentage of subscribers from any given month are still active today.
• Revenue by plan: You can break down revenue contribution by plan tier at any point in time.

Security and Compliance

• PCI DSS scope minimized: Use a provider-hosted collection flow to keep raw card data off your servers, and confirm the PCI obligations that still apply to your integration.
• Billing data access controls: Only authorized internal roles can view customer billing records and payment method details.
• Audit log: Changes to subscription state — plan changes, cancellations, manual adjustments — are logged with timestamp and the actor who initiated the change.

Discuss subscription billing infrastructure with LinkIT.