Migrate a bill payment API without duplicating customer orders
Plan a provider cutover with product mapping, separate credentials, ownership of unresolved orders and rollback rules that prevent accidental repeat purchases.
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A migration has two workloads: new orders that should use the new integration and existing orders that still need a final answer. Switching a base URL for both can make an old pending purchase look missing and tempt the application to buy it again.
Assign each order to its original integration
Persist the provider or integration identity, environment, external reference and returned transaction ID with every order. Keep the original credentials and recovery path available for unresolved orders while your access remains valid.
Route status reads, webhook processing and reconciliation by that stored identity. New configuration should not overwrite the history of an order already submitted. References and product IDs from one platform must not be assumed to identify the same records on another.
| Migration item | Preparation |
|---|---|
| Product mapping | Discover actual products and compare network, size, duration and required fields |
| Pricing | Recalculate retail rules from the new costs and confirm customer-facing changes |
| Credentials | Separate environments and restrict permissions to the required work |
| Webhooks | Keep endpoint secrets and event parsers distinct |
| Pending orders | Continue recovery through the integration that accepted them |
| Rollback | Route eligible new orders back without resubmitting old ones |
Rehearse with reads and sandbox orders
Validate catalogue mapping and response parsing before any live cutover. An ID that looks like a familiar data bundle is not sufficient evidence of equivalence. Check the actual product attributes and make ambiguous mappings an explicit operator decision.
Use the new sandbox for controlled purchase scenarios. Simulate a missing create response, a repeated job and an event arriving after the routing configuration changes. Confirm that the original order still resolves through its saved integration identity.
Cut over a controlled set of new orders
Define an approved start time and a small eligible cohort for new submissions. Monitor completion, unresolved age and support cases. Keep an immediate way to pause new orders without hiding existing receipts.
Do not send the same live order to two payment APIs as a comparison test. Parallel purchases can both succeed. A migration comparison can use catalogue reads and separate, explicitly authorized test orders.
Make rollback about future routing
If the new integration needs to be paused, stop new submissions and continue reconciling orders it already accepted. An unknown outcome is not a failed order that can safely be retried elsewhere.
Keep both sets of transaction records until every outstanding case has an established resolution under your retention policy. Finish the migration only after operators can explain the remaining balances, unresolved orders and customer refunds. Moving credentials is the easy part; preserving the history is what makes the cutover supportable.