> For the complete documentation index, see [llms.txt](https://docs.loginwithlink.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.loginwithlink.com/use-api-only.md).

# Use API only

- [About this option: API only](https://docs.loginwithlink.com/use-api-only/about-this-option-api-only.md)
- [Lookup email](https://docs.loginwithlink.com/use-api-only/lookup-email.md): Check if user exists on Link network
- [Start verification](https://docs.loginwithlink.com/use-api-only/lookup-email/start-verification.md): "Start verification" means "ask Stripe to send the six-digit code"
- [Authenticate](https://docs.loginwithlink.com/use-api-only/authenticate.md): "Authenticate" means "Let the user enter their 2FA code to Stripe, and tell me if they authenticated correctly"