asked by
on 9/9/15I do not know the answer but it may be that iherb does not take Visa debit card.
I would say that you could email or chat with them to try to find out how to make your purchase, but I think there is almost zero chance that you will get a prompt quality answer to your question. You will only have wasted your time.
Forget about ordering from iherb. Also they have a horrible retirun policy and if you make high dollar purchases, you deserve some protection to return items that are not satisfactory.