Create and manage subscriptions with Flex

Flex supports subscriptions for Checkout Sessions and Payment Links allowing customers to use their HSA/FSA for recurring purchases.

This is currently only supported for products that are eligible through a Letter of Medical Necessity.

The Letter of Medical Necessity is valid for 12 months and will only be issued when the customer first started the transaction for the subscription. After the 12 months, the customer will need to be approved for another Letter of Medical Necessity. Flex will inform the user that their Letter is set to expire and will follow up with the customer.