> ## Documentation Index
> Fetch the complete documentation index at: https://docs.withflex.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Flex Shopify Payment App
> Flex provides a Shopify payment app to make it easy to accept HSA/FSA payments in your Shopify store checkout flow.
Flex provides a Shopify payment app to make it easy to accept HSA/FSA payments in your Shopify store checkout flow.
## Shopify checkout page
When a customer goes to checkout from your Shopify store, they'll be able to select "Flex | Pay with HSA/FSA" and then be redirected to a hosted Flex Checkout page.
## Hosted Flex checkout page
Upon successful completion, the customer will be redirected back to the Shopify success order page. The order will appear in your Shopify admin just like a regular order.
