A payment integration should be testable and idempotent, not just a redirect to a success page.
Step-by-step workflow
01
Confirm business eligibility
Review processor availability, entity requirements, supported products and tax obligations.
02
Separate public and secret variables
Keep secret keys only in trusted server routes or secure deployment settings.
03
Create checkout sessions server-side
Validate product IDs and price references against the database, not visitor totals.
04
Verify webhooks
Follow maintained provider SDK guidance for signature checks, deduplication and retries.
05
Reconcile state
Mark an order paid only on authoritative verified events and provide a support/refund path.
Editorial note
Examples are starting points, not production security audits. Confirm dependencies, versions and pricing using linked vendor documentation.