Payments can fail or be declined for a number of reasons, and it’s understandably frustrating when they represent a loss of legitimate business. However, certain failures are actually preventative measures working in your favor to minimize the possibility of a fraudulent payment, that otherwise could result in a dispute.
Is it an HSA or FSA card?
You can definitely process these types of cars in SimplePractice, however, HSA and FSA cards require that your business have a special classification (called an MCC) set so that the card companies know that your products and services are directly related to a patient’s medical needs. If your business needs to accept these cards, please contact stripe directly to enable this in your account.
Why else was this client's card declined?
You can read about the main types of declines and ways to tackle them in Stripe's help center here.