# Fluxrate

## Docs

- [API Keys](https://docs.fluxrate.co/developers/api-keys.md): Create and manage scoped API keys for SDK integration and widget embedding.
- [SDK Overview](https://docs.fluxrate.co/developers/sdk/overview.md): Integrate usage tracking into your backend with the Fluxrate SDK endpoint.
- [Tracking Usage](https://docs.fluxrate.co/developers/sdk/tracking-usage.md): Code examples for tracking usage events in Python, Node.js, Go, and more.
- [Webhooks](https://docs.fluxrate.co/developers/webhooks.md): Receive real-time notifications when billing events occur in Fluxrate.
- [Customer Portal](https://docs.fluxrate.co/guide/customers/customer-portal.md): Embed a customer-facing billing portal directly in your product.
- [Managing Customers](https://docs.fluxrate.co/guide/customers/managing-customers.md): Create, update, search, and delete customers in Fluxrate.
- [Customers Overview](https://docs.fluxrate.co/guide/customers/overview.md): Manage your end customers — create profiles, track usage, and view billing history.
- [Custom Features](https://docs.fluxrate.co/guide/features/custom-features.md): Arbitrary text or numeric entitlement values for plan-specific limits and capabilities.
- [Meter Features](https://docs.fluxrate.co/guide/features/meter-features.md): Track quantitative usage with meter features — set limits, reset periods, and aggregation types.
- [Features Overview](https://docs.fluxrate.co/guide/features/overview.md): Features define what each plan unlocks for your customers — usage limits, boolean flags, and custom entitlements.
- [Switch Features](https://docs.fluxrate.co/guide/features/switch-features.md): Boolean feature flags to enable or disable capabilities per plan tier.
- [Invoice Lifecycle](https://docs.fluxrate.co/guide/invoicing/invoice-lifecycle.md): Status transitions, finalization rules, and how to manage invoices through their lifecycle.
- [Manual Invoices](https://docs.fluxrate.co/guide/invoicing/manual-invoices.md): Create one-off invoices for custom billing scenarios outside the subscription cycle.
- [Invoicing Overview](https://docs.fluxrate.co/guide/invoicing/overview.md): How Fluxrate generates, finalizes, and delivers invoices to your customers.
- [PDF & Email Delivery](https://docs.fluxrate.co/guide/invoicing/pdf-and-email.md): Generate PDF invoices and email them to customers with payment links.
- [Public Invoices](https://docs.fluxrate.co/guide/invoicing/public-invoices.md): Share invoices with customers via secure public URLs — no login required.
- [Aggregation Types](https://docs.fluxrate.co/guide/metering/aggregation-types.md): How Fluxrate aggregates raw usage events into billable quantities — SUM, MAX, UNIQUE_COUNT, and LAST.
- [Usage Metering Overview](https://docs.fluxrate.co/guide/metering/overview.md): Understand how Fluxrate tracks, aggregates, and bills for usage events.
- [Tracking Events](https://docs.fluxrate.co/guide/metering/tracking-events.md): Send usage events from your backend to Fluxrate using the SDK endpoint or REST API.
- [Usage Analytics](https://docs.fluxrate.co/guide/metering/usage-analytics.md): Query, visualize, and analyze usage data across customers, meters, and time periods.
- [Charges](https://docs.fluxrate.co/guide/plans/charges.md): Charges (prices) define how much a customer is billed on a plan — fixed fees and usage-based pricing.
- [Fixed Pricing](https://docs.fluxrate.co/guide/plans/fixed-pricing.md): Charge customers a flat recurring fee — the simplest and most predictable billing model.
- [Hybrid Pricing](https://docs.fluxrate.co/guide/plans/hybrid-pricing.md): Combine a fixed base fee with usage-based charges for the most flexible pricing model.
- [Plans Overview](https://docs.fluxrate.co/guide/plans/overview.md): Plans define the pricing structure your customers subscribe to — from flat fees to usage-based and hybrid models.
- [Usage-based Pricing](https://docs.fluxrate.co/guide/plans/usage-based-pricing.md): Charge customers based on what they actually consume — the pay-as-you-go model.
- [Cancellation](https://docs.fluxrate.co/guide/subscriptions/cancellation.md): Cancel subscriptions immediately or at the end of the billing period.
- [Subscription Lifecycle](https://docs.fluxrate.co/guide/subscriptions/lifecycle.md): How subscriptions progress through billing periods, status transitions, and invoice generation.
- [Subscriptions Overview](https://docs.fluxrate.co/guide/subscriptions/overview.md): Subscriptions link customers to plans and drive the billing lifecycle in Fluxrate.
- [Trial Periods](https://docs.fluxrate.co/guide/subscriptions/trial-periods.md): Offer free trials before billing begins on a subscription.
- [Overview](https://docs.fluxrate.co/integrations/overview.md): Connect Fluxrate to your payment gateway and collect payments directly from your invoices.
- [Razorpay](https://docs.fluxrate.co/integrations/razorpay.md): Accept UPI, cards, net banking, and wallets for Indian customers. Generate payment links automatically on every finalized invoice.
- [Stripe](https://docs.fluxrate.co/integrations/stripe.md): Accept cards, Apple Pay, Google Pay, and 135+ currencies. Generate payment links automatically on every finalized invoice.
- [Introduction](https://docs.fluxrate.co/introduction.md): Fluxrate is a developer-first billing infrastructure for SaaS companies supporting fixed, usage-based, and hybrid pricing out of the box.
- [Quickstart](https://docs.fluxrate.co/quickstart.md): Track your first usage event and generate an invoice in under 10 minutes.

## OpenAPI Specs

- [openapi](https://docs.fluxrate.co/api-reference/openapi.json)