When Dermstore saw customers actively searching for ways to use HSA/FSA funds on skincare, it partnered with Flex to turn that demand into a seamless payment experience. The result: 43% higher AOV, 30% of Flex customers new to Dermstore, and HSA/FSA purchases contributing up to 22% of revenue during peak periods.
Anxiety / Stress Relief is often HSA/FSA eligible with a Letter of Medical Necessity. See what qualifies, which conditions count, and how to pay with pre-tax dollars at checkout.
Hair removal and at-home IPL can become HSA/FSA eligible with a Letter of Medical Necessity for qualifying conditions. See what qualifies and how to pay.
Sleep Aids are often HSA/FSA eligible with a Letter of Medical Necessity. See what qualifies, which conditions count, and how to pay with pre-tax dollars at checkout.
Massage guns can be HSA/FSA eligible for qualifying customers, and most clear at checkout. See which conditions qualify and how to pay with Flex.
At-home sperm tests often clear at checkout, while fertility supplements need a Letter of Medical Necessity. See what qualifies and how to pay with Flex.
Find out what an HSA overcontribution is, how to correct it without penalties, and what the consequences are for leaving the excess amount in the account.
Learn the top HSA strategies for saving money, investing funds, maximizing reimbursements, and spending on eligible wellness products while reducing taxes.
When The Pause Life wanted to let customers pay with HSA/FSA funds, including on subscriptions, it chose Flex. The result: a 52% higher AOV on HSA/FSA orders, checkout completion above 80%, and a seamless experience for customers and internal teams alike.
Compare the 9 best red light therapy devices, their benefits, and how to determine if you're eligible to buy RLT devices using your HSA or FSA funds.
Learn what HSA catch-up contributions are, how they work, and how you can leverage them to maximize your healthcare funds and save on medical expenses.
Learn when melatonin can be HSA/FSA eligible, why an LMN is typically needed, what makes it eligible, how to qualify, and how to purchase it conveniently.
Learn how super greens powder works, tips to get the best results, and compare the leading super greens powders so you can find the right fit for you.
Compare the 10 best period underwear, their health and cost benefits, and how to determine if you’re eligible to buy them using your HSA or FSA funds.
Understand why toothpaste doesn’t automatically qualify as HSA or FSA eligible, and what qualifying conditions and documentation can make it eligible.
The rebuilt Flex Shopify Marketing App syncs HSA/FSA product eligibility from Flex to the Shopify admin, adds dynamic product badges, and lets you build a dedicated HSA/FSA landing page from pre-built blocks—no custom development needed.
Shop Pay quietly added a “Pay another way” option that lets logged-in shoppers check out with their HSA/FSA card through Flex—without dropping to a blank guest checkout. Here’s what changed and what Shopify merchants should do.
A real MCP use case: how Flex built a custom MCP server so a non-technical merchant could manage subscriptions and payments by chatting with an AI, with no API, no dashboard, and no support tickets.
For most HSA/FSA purchases, customers pay out of pocket and have to file a reimbursement claim afterward —and that's where the experience breaks down. Flex now lets your customers file that claim, with their Letter of Medical Necessity, directly inside the Flex Consumer Portal.
The IRS raised 2027 HSA contribution limits to $4,500 (self-only) and $9,000 (family), up from $4,400 and $8,750. Here are the full 2027 HSA and HDHP limits, the age-55 catch-up, and what changed under the One Big Beautiful Bill Act.
Flex MCP is a new MCP server that connects AI assistants like Claude, Cursor, Codex, and Windsurf directly to your Flex account, so you can look up orders, reconcile payments, manage billing, and run reports without leaving your coding or productivity tools.
Lifestyle Spending Accounts (LSAs) are one of the most flexible employer benefits on the market. Here's what an LSA covers, how it compares to an HSA or FSA, and how to stack all three to maximize your pre-tax savings on wellness.
Find out how you can claim HSA expenses from previous years, including what the rules are and how reimbursements work when withdrawing funds for purchases.
Learn which fertility treatments, tests, and monitors are HSA/FSA eligible and how to easily buy approved products using your benefits funds online today.
Find out when women’s shoes are HSA and FSA eligible, why a Letter of Medical Necessity (LMN) is almost always required, and how to buy them conveniently.
We’ve compiled a list of over 200 FSA eligible items, and explained when each item is always eligible, or eligible with a Letter of Medical Necessity.
Find out precisely what the HSA contribution deadline is, when it is, and how it works so you can maximize your tax-advantaged dollars and avoid penalties.
Learn about key HSA/FSA policy proposals, including HSA modernization, caregiver support, and higher DCFSA limits—and how you can advocate for change.
Learn when mattresses qualify for HSA/FSA spending, including IRS rules, Revenue Ruling 55-261, and why a Letter of Medical Necessity is required.
Learn what makes a product or service a qualified HSA/FSA expense under IRS rules, including IRC § 213(d), Publication 502, and eligibility categories.
We built a Slack agent that can trace a transaction end to end—and, when it finds a bug, open a pull request with a proposed fix.
Learn whether period underwear is HSA or FSA eligible, when you may need an LMN, and how to purchase qualifying products using your healthcare benefits.