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Documentation Index

Fetch the complete documentation index at: https://docs.withflex.com/llms.txt

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Flex drives measurable impact across our partners. Merchants who market HSA/FSA eligibility throughout the customer journey see higher AOVs, increased revenue, and stronger customer retention. Our merchant success assets and resources are built to help you unlock this value while enhancing the customer experience. Now that you’re set up to accept HSA/FSA payments, there are a few final steps to complete to ensure you’re making the most of Flex — and to start driving more HSA/FSA orders.

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Post-implementation checklist

✔️ Message HSA/FSA throughout your site
✔️ Send your first HSA/FSA email
✔️ Post your first HSA/FSA social
✔️ Launch your first HSA/FSA ad
✔️ Prep your support team for common questions

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How to talk about HSA/FSA payments

Unlike the pharmaceutical space, HSA/FSA marketing isn’t tightly regulated — but that doesn’t mean anything goes. The IRS has issued alerts around misleading messaging, especially when products are not always eligible or require special documentation to qualify. Your messaging will depend on your product’s eligibility category. If you’re unsure where your products fall, or if you span both categories, reach out to support@withflex.com for guidance.

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1. Always eligible

Products that are always eligible are defined by IRS guidelines as medical expenses that don’t require additional documentation to qualify. These typically include:
  • Eyeglasses
  • OTC medications
  • Feminine hygiene products
  • Medical devices
  • Sunscreen
These products can confidently be marketed as “HSA/FSA eligible.” Just make sure this messaging only appears alongside qualifying SKUs if your catalog includes a mix.

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2. Dual use

Dual use products may qualify for HSA/FSA use, but only with a Letter of Medical Necessity (LOMN). These are products that support health and wellness but also have a medical application. Examples include:
  • Exercise programs or equipment
  • Orthopedic footwear
  • Certain types of apparel or recovery products
If you offer dual use products, your messaging should make it clear that only qualifying customers can use HSA/FSA funds. Eligibility is determined through a clinical assessment — which Flex provides via telehealth during checkout.

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Messaging guidelines for dual use products

Use language that sets the right expectations. Here are some compliant options:
  • “HSA/FSA eligible for qualifying customers”
  • “Qualifying customers may use HSA/FSA funds”
  • “May qualify for HSA/FSA”
  • “Find out if you qualify to use your HSA/FSA”
For headlines, you can also use “HSA/FSA Eligible*” with a footnote or tooltip linking to more information about who qualifies. For both categories, we recommend creating a simple landing page or adding a few FAQs to help customers understand how HSA/FSA payments work and what qualifies.