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You can find the updated Miva 10 Reference Guide here
Use the Payment Settings section to configure the payment options that you want to offer customers during checkout. You must enable at least one payment option or there will be no way for customers to purchase items in your store. Free items that you offer are an exception. See Skip Shipping/Payment Selection for Free Orders.
To see all of the payment methods that you have access to in your store:
Over time, some payment options are dropped from Miva Merchant.
Beginning in PR8 Update 7 the following payment options have been removed and are no longer supported:
If you are already using one of these options you can continue to use it after you install PR8 Update 7. But if you create a new store with PR8 Update 7, the options will not appear in the admin interface.