MRR (Monthly Recurring Revenue)

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.

Idempotency

Property of an operation that produces the same result no matter how many times it runs.

Exponential Backoff

A retry strategy where each subsequent retry waits exponentially longer than the last (e.g.