Yes, you can accept payments using HSA cards after following the steps below

1. Set up a Stripe account via our platform. Please refer to this article for more information on how to create a Stripe account on the platform. 

2. Contact Stripe directly to configure the ability to accept HSA payments through your OnCall account. 

Please note that HSA cards require that your business have a special classification (called an MCC or Merchant Category Code) set so that the card companies know that your products and services are directly related to a client's medical needs. 

Keep in mind that just because an account is enabled to accept HSA payments doesn't guarantee a card won't be declined. Card issuers are still at the liberty to authorize or decline any payments as they would with any other type of credit card. 

More information could be found on the Stripe website https://support.stripe.com/questions/process-hsa-fsa-cards