Integration checklist — from sandbox to guarded production

Week zero — correctness

Task	Owners	Notes
Run Quickstart in CI smoke job	Backend	Persist Seal-Trace-Id artefacts for seven days minimum.
Mirror Authentication policies in Terraform	Security	Separate secrets per deployment region—even sandboxes leak into logs sooner than you expect.
Validate Webhook signatures using replay tooling	Backend	Simulate clock skew +/- five minutes deliberately.

Week one — durability

Build workers idempotent front-to-back: store job.id keyed by Idempotency-Key in your datastore before issuing dependent finance writes.

Prefer streaming uploads over buffering entire HR PDFs inside pod RAM—respect multipart chunk guidance from support playbooks once published.

Week two — readiness review

Schedule a tabletop with customer success—we rehearse degraded KMS failover, revoked keys mid-upload, and webhook replay storms documented under Errors so your runbooks cite the same taxonomy we use internally.