Idempotency
Property of an operation that produces the same result no matter how many times it runs. Critical for webhook handlers, payment APIs, and any retry-driven system.
Sources
- IETF — RFC 9110 §9.2.2 — Idempotent Methods
- Stripe Docs — Idempotent requests
Related terms
MRR (Monthly Recurring Revenue)
The predictable monthly subscription revenue a SaaS earns, normalized so annual plans count as 1/12 per month.
ARR (Annual Recurring Revenue)
Annualised subscription revenue, i.e.
ACV (Annual Contract Value)
The yearly value of a single customer contract, normalized to one year.
Churn
The rate at which customers cancel or downgrade.
Webhook
An HTTP POST request a service sends to a URL you control when an event happens (e.g.
Exponential Backoff
A retry strategy where each subsequent retry waits exponentially longer than the last (e.g.
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