Flex is a payment platform that enables businesses to accept HSA/FSA cards, offering a hosted checkout page or integration tools for existing payment systems.

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Flex is for health, wellness, and ecommerce businesses that want to accept HSA and FSA payments without building that payment and eligibility process from scratch. It adds HSA/FSA payment options to a business’s website or app through a hosted checkout, integrations with supported platforms, or API-based tools for a custom checkout. Businesses can use Flex to manage purchase eligibility, including physician-reviewed Letters of Medical Necessity when required, and support split payments when an HSA/FSA card does not cover the full amount. The platform also supports recurring payments and reimbursement flows. Its merchant dashboard provides payment and checkout data, eligibility insights, performance analytics, and reports for transaction reconciliation—useful for teams managing an HSA/FSA sales channel alongside their existing payment operations.

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