Kelviq
Combine software payments, usage billing, and feature access
Billing and merchant of record infrastructure for software businesses

Polar helps software businesses sell subscriptions and digital products through hosted checkout, embedded checkout, and APIs. Teams define products and prices, connect payment events to their applications, and manage customers through a shared billing system. Subscription plans, metered usage, and prepaid credits support different ways of charging for a service.
As merchant of record, Polar handles payment collection and applicable sales tax administration for supported sales. It can also deliver benefits such as license keys, file downloads, and access to connected services. SDKs, webhooks, and framework integrations help developers keep purchases and product access synchronized. Its core billing service is available publicly; the separately advertised new Usage Billing Engine remains in early access.
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