If you use Square, you can accept payment using HSA and FSA cards. You will first need to contact Square to configure your account before you can accept these payments via Practice Better.
More details on accepting HSA/FSA cards can be found on the Square website:
Licensed health care providers and pharmacies can process Health Savings Account (HSA) and Flexible Spending Account (FSA) cards with Square. We don’t currently support EBT or other benefits cards.
If you are a healthcare provider and you selected the Medical Practitioner, Medical Services, or Dentistry business category during the signup process, you should have no trouble accepting HSA or FSA cards. If you believe your business category needs to be updated, contact us.
https://squareup.com/help/us/en/article/5085-accepted-cards#accept-hsa-fsa-cards