Subscription billing is more than a checkout page. A SaaS application must connect payment events to customer records, subscription states, and the features customers are entitled to use.
Design Your Pricing Model
Define plans, billing intervals, trial rules, seat limits, and feature entitlements. Keep the pricing model consistent with your product's actual capabilities.
Integrate the Payment Provider
Implement the provider's supported checkout and customer-management flows. Securely associate customer and subscription identifiers with the correct application accounts.
Handle Webhooks
Payment providers send events when subscriptions change. Webhook handling should validate authenticity, tolerate repeated deliveries, and manage relevant event-ordering issues.
Connect Billing to Entitlements
Determine how active, canceled, past-due, and trial subscriptions affect access. Avoid treating a successful checkout redirect as the only proof of payment status.
Test Failure Scenarios
Test failed payments, cancellations, renewals, duplicate events, and interrupted webhook processing.
Conclusion
Reliable subscription billing requires coordinated payment handling and application authorization.
Agentium Start provides a Paddle billing reference path covering checkout, the customer portal, webhooks, plans, and entitlements within its documented scope. Check the feature inventory before adapting it to your billing requirements.