For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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DEVELOPER DOCUMENTATION

HSA / FSA Payments

Integrate HSA/FSA payments in minutes. Simple REST API with Python and TypeScript SDKs. Compliance, LMN generation, and eligibility verification handled for you.

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Business growth with HSA/FSA

Getting Started

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Checkout

Process one-time HSA/FSA payments at checkout

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Subscriptions

Handle recurring payments and subscription management

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API Reference

Complete reference for all endpoints and SDKs

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OpenAPI Spec

Download the spec for AI agents, Postman, SDK generation, or offline reference

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