Glossary

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Glossary / Evaluation and implementation guide

API Replay Plan

An API replay plan is a prepared strategy for reprocessing API events that failed or were lost during an outage, covering where failed events are stored, how they are identified, in what order they are replayed, and how duplicates are prevented on the receiving side.

It is a deliberate reprocessing strategy, distinct from Retry Logic, which handles immediate automatic retries while the connection is still up. Replay determines whether an outage means permanent data loss or full recovery.

A practical example

Example: a CRM outage lasts four hours and your MAP queues 12,000 lead updates. The replay plan stores each failed event with its original timestamp and a unique event ID.

After recovery, events replay in chronological order, and the CRM's upsert behavior keyed on event ID prevents duplicate contact creation.

What to evaluate before investing

  • Ask where failed events persist, for how long, and whether replay can be triggered manually or only automatically.
  • Verify how duplicates are detected on the receiving side, such as idempotency keys or upsert behavior.
  • Check whether replay preserves original event order and timestamps or rewrites them.

Limitations and tradeoffs

Replay depends on storage that many default connectors lack; without persisted failed events, an outage window is simply gone, and replaying stale events can overwrite newer data if ordering isn't controlled.

Plan your next step with MeshLine

Connect this decision to your automation, organic marketing and customer lifecycle management. In a MeshLine demo, discuss your existing tools, the scope you need and how to measure the result.