Flex, Pay With HSA/FSA

Enable HSA/FSA as a payment option

by Flex Technology Co · Launched: November 2023

5.0 (7) on Shopify Used by 621 Shopify stores

See which stores use it — by country, co-installs & competitive gaps → Unlock with Pro

Manage this app

Verify your developer profile to earn a badge and build trust for your app.

HSA/FSA payments, simplified.

Get it on Shopify →

About Flex, Pay With HSA/FSA

Flex allows merchants that qualify to accept HSA/FSA as a payment option directly in the checkout flow. Accept HSA/FSA payments directly in the checkout flow Auto-substantiate during checkout Qualify your product with a Letter of Medical Necessity

Last verified: July 15, 2026 · Fresh

App details

Developer: Flex Technology Co
Category: Marketing & conversion
Launched: November 2023
Rating: 5.0 (7) on Shopify

Key features

HSA/FSA payments, simplified

Integrations with:

Checkout

Ratings & reviews

based on 7 Shopify App Store reviews

Use the arrows to read individual reviews

Setting up HSA/FSA payments with Flex on Shopify was a smooth and straightforward process, thanks to the amazing support from Benny! He guided me every step of the way and made sure everything was set up perfectly. It's been a great experience, and now my customers can easily pay with their HSA/FSA accounts. Highly recommend!

— BETTERGUARDS-US

The Flex team was easy to work with and really gave us the tools we needed to both set it up on the back end and market using HSA/FSA payments to our customers. Really happy with how things are going so far!

— GutPersonal

Awesome app with epic support that allows us to accept FSA/HSA payments seamlessly. The team (particularly Nick and Benny) have been so helpful informing and helping us with a process we didn't fully understand ourselves. Every Shopify app should be built to this app's standard.

— Shakti Mat USA

This is the best HSA/FSA payment solution by far (we've tried a few). Super smooth customer experience and the Flex support team has been very responsive and helpful through the integration/onboarding process. 5/5 highly recommend!

— Milkify

We have been very happy with the Flex app's functionality and the team's support. The app has enabled our customers to easily use HSA/FSA payments at checkout without any complex setup on our end. Not only that, the team's support is excellent and they actively take the time to get our feedback and suggestions and then actually add them to their development pipeline so that their app keeps getting...

— Nanobébé US

The app was super easy to install, and the Flex team has been excellent to work with! This app is a great way to better serve our customers who want to use their FSA / HSA dollars more easily.

— Embr Labs

Really easy to install. This app is exactly what we were looking for as we are building out our business. This app allowed us to offer a way for customers to use their HSA/FSA card directly on our website. This has been exceedingly helpful to better serve our customers. the withFlex team has been a joy to work. We don't know what we would do without withFlex. Cannot recommend enough.

— Sundaze Heated Shorts

Overview 1 / 7