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Definition
At-least-once is the delivery guarantee Credicorp webhooks use. It means no event is ever silently dropped, but a single event may be delivered more than once (after a slow acknowledgement or a retry). The trade-off for never losing an event is that your handler must be idempotent. Contrast with at-most-once (may drop, never duplicates) and exactly-once (neither, but far harder to guarantee).
Frequently asked questions
Why not exactly-once?
Exactly-once across a network boundary is extremely hard and usually an illusion. At-least-once plus an idempotent consumer gives you the same practical result more simply. See idempotency.
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