A client tried to pay an invoice online with Stripe integration and said when she clicked the button "nothing happened". Since then, when we click the "Pay Now" button we see:

"Looks like you've already initiated payment(s) for this invoice. Initiating a new payment will not override the payment(s) in progress. Are you sure you want to proceed?"

We aren't sure how to proceed. Is a payment pending? It's been two business days and nothing has come through, but I don't want her to pay twice. I haven't seen this before.