Zoho Books Billing Bridge
Usage-to-invoice pipeline pushing metered product events into Zoho Books with tax handling and dunning hooks.
Reference implementation for our metered-billing integration standard.
Teams that price on usage often meter inside the product and invoice inside Zoho Books, with a spreadsheet bridging the two at month end. The bridge is the failure point: late invoices, missed usage lines, tax applied by hand, and no way to answer a customer asking why a figure moved.
- A metering store that aggregates raw product events into billable periods with immutable period close, so a closed month cannot be silently restated.
- A Zoho Books integration creating invoices and line items through the Books API with idempotency keys per period-customer pair, so a retried run never double-bills.
- Tax and currency resolution driven by the customer's registered place of supply, with the applied rule recorded on the invoice line for audit.
- Dunning hooks that listen for Zoho payment events and expose overdue state back to the product for entitlement decisions.
A simulated month of 180,000 usage events across 420 accounts closed and invoiced in 96 seconds with every invoice traceable to its underlying event rows. Forced mid-run failures and replays produced no duplicate invoices across 50 fault-injection runs.
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