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  5. WooCommerce plugins

  7. Flex HSA/FSA Payments

Flex HSA/FSA Payments

This is the official plugin for accepting payments via the Flex payment gateway on a WooCommerce store.

20+ active installsFree on WordPress.org
View on WordPress.orgSupport forum
Will this break my store?

What the WordPress.org registry says about keeping Flex HSA/FSA Payments running.

WordPress compatibility
Tested to 7.0.2
Tested against the WordPress branch in use today.
Last updated
20 days ago
At least 27.3 releases a year since launch. WordPress.org only lists versions still available for download, so the real number may be higher.
Requires PHP
8.1
Your host must be running at least this version.
Requires WordPress
6.7
Requires other plugins
woocommerce
These must be installed and active first.
Contributors
2
20+ active installsWordPress.org reports installs in bands, not exact counts.
Maintenance & trust

Scored on how Flex HSA/FSA Payments is looked after — not on how many stores run it.

Well maintained
Not enough public feedback to put a confident number on this one. Little public feedback — score rests mostly on release activity. What we can see is below.
Maintenance
35 / 35
Updated 18 days ago.
WordPress compatibility
20 / 20
Tested to WP 7.0.2 (current).
Support responsiveness
Not enough data
Only 0 support thread(s) — not enough to judge.
Merchant satisfaction
Not enough data
No ratings yet.
Listing transparency
10 / 10
Provides: screenshots, description, homepage
2 of 5 measures had too little evidence to score. They are left out of the total rather than counted as zero — otherwise a plugin would be marked down for being small rather than for being poorly kept.Measured 2026-08-01 from the WordPress.org plugin registry.
Ratings

No one has rated this plugin on WordPress.org yet. That is a statement about the ratings page, not about the plugin — plenty of well-kept plugins never collect them.

Flex integrates with WooCommerce to enable merchants to accept Health Savings Account (HSA) and Flexible Spending Account (FSA) payments. Our plugin helps you tap into the growing $150 billion HSA/FSA market and makes it easy to offer compliant, seamless payment options to your customers.

Features:

  • Accept HSA/FSA payments directly in your WooCommerce checkout flow
  • Product sync and eligibility assistance
  • IIAS support for products deemed “always eligible”
  • Letter of Medical Necessity (LOMN) directly in checkout for products deemed “dual use”

Flex partners have seen:

  • 20% increase in average order volume
  • 17% increase in revenue
  • Access to a $150 billion and growing HSA/FSA market

How to Get Started:

Visit withflex.com to learn more or contact us at hello@withflex.com to get started.

What are HSAs and FSAs?

Health savings accounts (HSAs) and flexible spending accounts (FSAs) are tax advantaged accounts that can be used for health related purchases.

What can HSA or FSA dollars be spent on?

Traditionally, health expenses are limited to spending at healthcare facilities (think doctor’s office, dentist office etc) or on a specific list of items, usually available at a pharmacy like CVS or Walgreens.

Flex works with wellness partners to enable you to spend your HSA/FSA money with them as well. Our partners include sleep, fitness, and meditation apps, nutrition programs, in person gyms, wearables and even medical tourism! Reach out to support@withflex.com if you’re interested in learning more!

What is a Letter of Medical Necessity?

A Letter of Medical Necessity is a note from a licensed healthcare provider stating that a product is needed to treat or manage a medical condition. Some products require this documentation to qualify for HSA or FSA payment, as required by the IRS.

Flex makes this process simple by offering asynchronous telehealth visits directly at checkout. If a Letter is needed, customers can complete a quick consultation and receive approval to pay with HSA/FSA. Within 24 hours of purchase, Flex will email an itemized receipt and any necessary documentation.

Categories
Payment gateways
Plugin details
Version3.3.7
Last updated2026-07-14 12:23am GMT
Added2025-05-19
Requires WordPress6.7
Tested up to7.0.2
Requires PHP8.1
Tags on WordPress.org
FSA
HSA
payments
woocommerce
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