First inspect the existing purchase. A browser timeout does not establish whether the provider accepted the payment. Starting a second checkout can create another purchase while the first is still being resolved.
Use the purchase's available status or recovery action and compare it with your bank's result. If the two disagree, contact support with the existing reference and the time of the attempt. Keep the receipt, but remove sensitive payment information before sharing it. Do not repeat an uncertain payment solely because the confirmation page failed to load.