At this time you cannot attach a Health Savings Account, Flexible Spending Account, or Health Reimbursement Account through the Add a Bank Account feature.
However, you can still reimburse yourself for qualified expenses and take advantage of these accounts! If a TempoPay purchase is also a qualified expense through your HSA, FSA, or HRA you can request a reimbursement from the account provider. The reimbursement will be deposited into your personal bank account.