BlogHow to Integrate HSA/FSA Checkout in Under a Week
Merchant Integration

How to Integrate HSA/FSA Checkout in Under a Week

Day-by-day guide: sign up, embed the widget, configure webhooks, test, and go live. From zero to accepting HSA/FSA in 5 days.

VeloMedicine Editorial Team3 min read

Day 1 — Sign Up and Get Your API Key

Register your merchant account, share the relevant parts of your product catalog, and receive your VeloMedicine API key.

This first step establishes the credentials and product context you need before embedding anything in checkout.

Day 2-3 — Add the Widget

Drop a single script tag into your checkout page and configure the product SKU, name, category, and price.

The widget handles the rest of the front-end experience, including consent, the health survey, and qualification status messaging.

Day 4 — Configure Webhooks

Set up HMAC-signed webhook notifications so your systems receive real-time updates when a customer qualifies, is denied, or receives an LMN.

Webhook delivery keeps fulfillment, analytics, and support workflows in sync with the qualification outcome.

Day 5 — Test and Go Live

Use sandbox mode to test the end-to-end flow, verify webhook delivery, and confirm that your checkout messaging is correct.

Once validation is complete, swap to production credentials and begin accepting HSA/FSA payments.

What Happens Behind the Scenes

When a customer submits a health survey, VeloMedicine's software organizes the responses, a licensed provider evaluates eligibility, and an LMN is issued if the customer qualifies.

The full workflow typically completes in under two minutes, which keeps the checkout experience fast while preserving clinical oversight.

Next step

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