Wholesail enables each customer "company" to keep one bank account and one credit card on file. Whichever user at the company adds the payment method "owns" it and can share permission for others to use it.
As the vendor, you may want to see which users own and manage payment accounts for the various companies that pay you through Wholesail.
On the "Customer Settings" screen you can see which users have access to payment methods that have been added to Wholesail and who has access to pay with them.
For any help with payment account management on behalf of your customers please reach out to firstname.lastname@example.org.