Billing Stack Migration Gate (Delivery)

Billing Stack Migration Gate (Delivery)

1. 01

   Map the client's current recurring revenue flows before touching any billing system

   Document every subscription, invoice, payment gateway, and tax jurisdiction the client operates in, including any manual workarounds that exist today.

2. 02

   Define the target billing architecture against the client's pricing model evolution

   Confirm whether the client needs flat-fee, usage-based, or hybrid billing, and whether they plan to introduce new pricing tiers within the next 12 months. This determines if a Merchant of Record like Paddle or a self-managed platform like Chargebee fits better.

3. 03

   Run a parallel billing test with a small subset of live customers

   Process a limited number of real invoices through the new system while the old one remains active, comparing timestamps, tax calculations, and payment success rates to catch discrepancies before full cutover.

4. 04

   Validate tax and compliance handling for every jurisdiction the client serves

   For cross-border clients, confirm whether the platform handles VAT, GST, and sales tax automatically, or if the agency must configure rates manually. A Merchant of Record like Paddle absorbs this burden, while self-managed tools like WHMCS require manual setup.

5. 05

   Test dunning and failed-payment recovery workflows end to end

   Simulate expired cards and insufficient funds to verify that retry logic, email notifications, and customer portal updates function correctly, since churn reduction depends on these automated sequences.

6. 06

   Prepare a rollback plan with a defined trigger threshold

   Agree with the client on the maximum acceptable error rate or revenue impact before reverting to the old system, and document the exact steps to restore service within a 4-hour window.

7. 07

   Schedule the cutover during a low-transaction window and monitor for 48 hours

   Migrate during off-peak hours, then track invoice generation, payment capture, and customer-facing billing emails closely for two full days to catch issues before they affect a full billing cycle.