> ## Documentation Index > Fetch the complete documentation index at: https://flowglad.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Introduction > Welcome to Flowglad's guides! Here you can find guides on how to implement Flowglad across various different frameworks and pricing models. Before getting started, make sure to [sign up](https://app.flowglad.com/sign-up) for a Flowglad account and a obtain test API key from [settings](https://app.flowglad.com/settings). You can checkout guides by framework or read more about the [pricing models](/guides/pricing-models) we cover in these guides. ## Next.js A hybrid billing model combining subscriptions with usage credits and one-time top-ups. Pure usage-based billing where customers purchase credit packs and consume them over time. A subscription model with multiple tiers where different features have monthly usage limits. A subscription model with included usage credits that renew each billing period. ## React + Vite A hybrid billing model combining subscriptions with usage credits and one-time top-ups. ## Tanstack Start A hybrid billing model combining subscriptions with usage credits and one-time top-ups.