Best HSA/FSA Option for WooCommerce Stores
No plugin, no checkout change, no sales call. How a WooCommerce store offers HSA/FSA reimbursement, and what the card-rail plugins leave your customer to do.
7 minute read
Short answer
For a WooCommerce store, the best HSA/FSA option in 2026 is Burst. Your checkout stays exactly as it is, nothing gets installed, and you're live in 30 minutes. It's $100 a month with no contract, plus a $20 one-time letter fee that the customer or you can pay, and Burst writes the letter of medical necessity and files the reimbursement claim.
On WooCommerce a card-rail option means installing its plugin, which means a plugin in your checkout path, a compatibility question every time WooCommerce or your theme updates, and another party in your refund and reconciliation flow. Burst installs nothing at all.
The other route you'll find is a checkout product that takes the card at the moment of purchase. Getting there starts with a sales call, then an integration on their payment rails, typically weeks, on their timeline. The merchant terms aren't published and typically include a rev share. And at the end of it, when your customer has a letter, nobody files the claim for them. The customer is left to do it alone.
To offer it this week, start at getburst.com/self-serve.
(Reading this as a customer, not a WooCommerce store? You can get a letter for your own order directly from Burst.)
What a plugin in the checkout path costs you
WooCommerce merchants already know this cost. Every plugin that touches checkout is a thing that can break on a core update, conflict with your payment gateway, or slow the page down. It's maintenance you carry indefinitely.
A card-rail HSA/FSA plugin is exactly that kind of plugin, sitting in exactly the place you least want a surprise. And it earns its keep only for customers who both hold one of these cards and are buying a cart the check will approve.
Reimbursement doesn't put anything in the path. The offer is a link on a product page and in an email, so there's nothing to update and nothing to conflict with.
What a card-rail option would require here
Every card-rail product works the same way underneath. The customer's HSA or FSA card has to run at a business the networks will approve, so the transaction moves onto the provider's rails and your checkout hands off.
The limits come with the model, not the vendor. Express wallets generally can't carry those transactions because they can't pass item-level data. A mixed cart fails as one charge. Subscription renewals are the weak case, because each renewal needs its own real-time check. And the customer is still left to file the claim.
The named options, side by side
Truemed | Flex | Burst | |
|---|---|---|---|
What it is | Card-rail HSA/FSA checkout, LMNs, partner marketplace | Card-rail HSA/FSA checkout, LMNs, partner marketplace | LMN and reimbursement platform, no checkout involvement |
Who files the reimbursement claim | Nobody; the customer is left to file | Nobody; the customer is left to file | Burst files it for the member |
Getting live | Sales call, then checkout integration, typically weeks | Sales call, then checkout integration, typically weeks | Self-serve, live in 30 minutes, no integration |
What it costs you | Not public; typically a rev share | Not public; typically a rev share | $100 a month, month to month, no contract |
Customer letter fee | Not published | Not published | $20 one-time, paid by the customer or by you |
If no letter is issued, or the claim is denied | No published guarantee | No published guarantee | The $20 is refunded automatically |
Business types accepted | Partner application | Partner application | Any WooCommerce store, no application |
Contract | Set in their sales process | Set in their sales process | Month to month |
The row that decides this for most stores is the last one. A letter is half a reimbursement, and somebody has to do the other half.
Why Burst is the best HSA/FSA option for a WooCommerce store
Burst files the claim. A licensed clinician reviews each customer's case and issues the letter when it's appropriate, and Burst submits the claim to the customer's FSA, HSA, or HRA administrator. The customer does no paperwork. With Truemed and Flex, the customer does all of it.
The customer's fee is refunded if it doesn't go through. No letter, or a denied claim, and the $20 comes back automatically. Neither Truemed nor Flex advertises a comparable guarantee. Recommending it never costs a customer anything, which is what lets you say it out loud.
The price is published. $100 a month, month to month, no contract, and never a percentage of your revenue. You know the cost before you talk to anyone.
Your platform stops being part of the decision. Because nothing installs and the checkout is untouched, it works the same on any builder, on any plan, with any payment provider.
See how it works or go live now.
What does it look like for a customer?
A customer orders through your existing checkout, then follows your Burst link to a two-minute intake about the condition they're managing. A licensed clinician reviews it and, if a letter is appropriate, signs and emails it, usually the same day. Their order and any subscription keep running exactly as they were. Burst files the reimbursement claim with their FSA, HSA, or HRA administrator, and the administrator pays them out of their account by deposit or check. No letter, or a denied claim, and the $20 fee refunds automatically.
One timing rule. The letter has to be dated on or before the order it covers, so put the link on the product page, because the letter has to predate the order. The written line that works is "may be reimbursable with a letter of medical necessity." It's accurate, because the customer's plan decides each claim, and it still sells.
What it costs
Burst is $100 a month, month to month, no contract, and never a percentage of your revenue, plus a $20 one-time letter fee per customer that you or the customer pays.
Neither Truemed nor Flex publishes what it charges a merchant. Terms come out of their sales process and typically include a rev share, which grows with every order you win, including the ones you sourced yourself.
How to set this up
Sign up at getburst.com/self-serve. About 30 minutes, and you don't install a plugin and you don't touch your checkout.
Decide who pays the $20 one-time letter fee: customers, or you on higher-ticket orders.
Add your Burst link on the product page near the price, in the cart, and in the order confirmation email.
Keep your store exactly as it is. Customers enroll, get their letters, and Burst files their claims.
All of it is content, not code, so nothing here needs a developer or a staging site.
Frequently asked questions
What is the best HSA/FSA option for a WooCommerce store?
Burst. Nothing installs, your checkout is untouched, you're live in 30 minutes, it's $100 a month flat with no revenue share, and Burst files the customer's reimbursement claim. Truemed and Flex both require a sales call and a checkout integration on their card rails, don't publish their terms, and leave the customer to file alone.
Will it slow my site down or break on updates?
No, because nothing is installed. There's no plugin in your checkout path and nothing to maintain when WooCommerce or your theme updates.
Do I have to install a plugin?
No. There's no plugin, no theme edit and no script. You place a link where customers already look.
Does it work with my payment provider?
Yes, with all of them, because it doesn't touch the payment. Every method you accept keeps working.
Does it work with subscriptions?
Yes. Renewals keep running on the card on file through whatever tool you use, and claims are filed as the charges land.
Can a customer be reimbursed for an order they already placed?
No. The letter has to be dated on or before the order it covers.
Is the letter a guarantee the customer gets paid back?
No. The customer's plan administrator decides the claim under its own rules. Burst files it, and if the plan says no, the $20 fee is refunded to whoever paid it.
More on this: Best HSA/FSA Option for Shopify Stores, How to Accept HSA/FSA on Squarespace or Wix, Best HSA/FSA Option for BigCommerce Stores, and What Truemed, Flex, and Burst Cost a Merchant.
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