HSA/FSA
Payments

Simplified

Attract new customers, grow your cart size, and increase conversion by accepting HSA/FSA payments.

HSA/FSA Payments Simplified

Attract new customers, grow your cart size, and increase conversion by accepting HSA/FSA payments.

HSA/FSA Payments Simplified

Attract new customers, grow your cart size, and increase conversion by accepting HSA/FSA payments.

HSA/FSA
Payments

Simplified

Attract new customers, grow your cart size, and increase conversion by accepting HSA/FSA payments.

HSA/FSA Payments Simplified

Attract new customers, grow your cart size, and increase conversion by accepting HSA/FSA payments.

Trusted by

Grow Your Business With Flex

Grow Your Business With Flex

Grow Your Business With Flex

Grow Your Business With Flex

Grow Your Business With Flex

MONTHLY REVENUE

+17%

Increase monthly revenue by accepting HSA/FSA payments.

AVERAGE ORDER VALUE

+20%

Increase average order value by accepting HSA/FSA payments.

MARKET

125B

Available money in HSA/FSAs to be spent on health related purchases.

The Fastest Way to Accept HSA/FSA

The Fastest Way to Accept HSA/FSA

The Fastest Way to Accept HSA/FSA

The Fastest Way to Accept HSA/FSA

Get up and running in as little as 1 hour with our Shopify Payment App or as little as 48hrs with Flex's Secure API.

Get up and running in as little as 1 hour with our Shopify Payment App or as little as 48hrs with Flex's Secure API.

Flex API Reference

Here you'll find all the endpoints exposed by Flex, learn how to use them and what they return.

Production Endpoint

https://api.withflex.com

Staging Endpoint

https://api-stg.withflex.com

Shopify Payment App

Flex allows merchants that qualify to accept HSA/FSA as a payment option directly in the Shopify checkout flow.

Manage HSA/FSA Payments

Manage HSA/FSA Payments

Manage HSA/FSA Payments

Manage HSA/FSA Payments

Flex has everything you need to manage your HSA/FSA payments via our partner dashboard.

Flex has everything you need to manage your HSA/FSA payments via our partner dashboard.

One Time Payments

Subscriptions

Coupons & Discounts

Refunds

Cancelations

Mixed Cart

Data Exports

Analyze HSA/FSA Payments as a Channel

Analyze HSA/FSA Payments as a Channel

Analyze HSA/FSA Payments as a Channel

Analyze HSA/FSA Payments as a Channel

Analyze HSA/FSA payments as a channel, understand your customers preferences, and grow revenue.

Analyze HSA/FSA payments as a channel, understand your customers preferences, and grow revenue.

Analyze HSA/FSA payments as a channel, understand your customers preferences, and grow revenue.

Analyze HSA/FSA payments as a channel, understand your customers preferences, and grow revenue.

Flex API Reference

Here you'll find all the endpoints exposed by Flex, learn how to use them and what they return.

Production Endpoint

https://api.withflex.com

Staging Endpoint

https://api-stg.withflex.com

Shopify Payment App

Flex allows merchants that qualify to accept HSA/FSA as a payment option directly in the Shopify checkout flow.

Built For Developers,
By Developers

Flex provides a prebuilt, hosted checkout page or UI building blocks to integrate HSA/FSA payments directly into your existing payments flow.

curl --location 'https://api.withflex.com/v1/checkout/sessions' \
--header 'Authorization: Bearer fsk_eyJhbGciOiJIUzM4NCJ9.eyJ1c2VyX2lkIjoiZmN1c18wMUg5VFNGR01HWjNKUFFGRUEzUTFEV1' \
--data '{
    "checkout_session": {
        "line_items": [
            {
                "price_id": "fprice_01HCZMDBA9HMZ8MZKK1T5A64S5",
                "quantity": 1
            }
        ],
        "success_url": "https://withflex.com/success",
        "mode": "payment"
    }
}'

Built For Developers,
By Developers

Flex provides a prebuilt, hosted checkout page or UI building blocks to integrate HSA/FSA payments directly into your existing payments flow.

curl --location 'https://api.withflex.com/v1/checkout/sessions' \
--header 'Authorization: Bearer fsk_eyJhbGciOiJIUzM4NCJ9.eyJ1c2VyX2lkIjoiZmN1c18wMUg5VFNGR01HWjNKUFFGRUEzUTFEV1' \
--data '{
    "checkout_session": {
        "line_items": [
            {
                "price_id": "fprice_01HCZMDBA9HMZ8MZKK1T5A64S5",
                "quantity": 1
            }
        ],
        "success_url": "https://withflex.com/success",
        "mode": "payment"
    }
}'

Built For Developers,
By Developers

Flex provides a prebuilt, hosted checkout page or UI building blocks to integrate HSA/FSA payments directly into your existing payments flow.

curl --location 'https://api.withflex.com/v1/checkout/sessions' \
--header 'Authorization: Bearer fsk_eyJhbGciOiJIUzM4NCJ9.eyJ1c2VyX2lkIjoiZmN1c18wMUg5VFNGR01HWjNKUFFGRUEzUTFEV1' \
--data '{
    "checkout_session": {
        "line_items": [
            {
                "price_id": "fprice_01HCZMDBA9HMZ8MZKK1T5A64S5",
                "quantity": 1
            }
        ],
        "success_url": "https://withflex.com/success",
        "mode": "payment"
    }
}'

Frequently Asked Questions

If you can’t find what you’re looking for, please reach out to hello@withflex.com

Why should I consider accepting HSA/FSA cards at my business?

How does Flex enable HSA/FSA payments?

How easy is it to add Flex as a payment option to my website?

How easy is it to add Flex as a payment option to my website?

GROW WITH FLEX

Ready to get started?

Ready to get started?

Ready to get started?