Recurring billing

Recurring billing invoices or charges a customer automatically on a fixed schedule — weekly, monthly, quarterly, annually or a custom cadence — for as long as a subscription, retainer or contract runs. It is the billing mechanism behind SaaS plans, memberships and agency retainers.

How it works

• A subscription records the price, the cadence, the start date and the rules: trial, notice period, auto-renew and proration policy.
• On each period boundary the system issues the invoice — exactly once per period — and either charges a saved payment method or sends a payment link.
• A failed payment moves the subscription to past due; retries and reminders (dunning) try to recover it before it lapses.
• Changes mid-period — upgrades, downgrades, pauses — are prorated onto the next invoice.

Why it matters

Recurring revenue is only predictable if the billing is. About one subscription charge in ten fails on the first attempt, and a quarter of lapsed subscriptions end on a payment failure rather than a decision — involuntary churn that retries recover.

In the US and the UK

• US: B2B customers often pay by ACH; card-on-file charging suits smaller plans. Involuntary churn runs at about a third of SaaS churn (Recurly, 2026).
• UK: Direct Debit and Faster Payments dominate B2B collection; statutory late-payment interest (8% over base) applies to overdue commercial invoices.

How Fynex does it

Fynex runs subscriptions on a versioned contract — trials, pause and resume, plan changes with a choice of proration policy — issues each period’s invoice exactly once, retries failed cards and recovers the subscription when it’s paid. See Subscriptions & Contracts.