FDMS is First Data Merchant Services
EMS is Elavon Merchant Services
Your client(s) should have a login for these accounts (and I assume the others you have listed will have the same facility) where they will be able to download the relevant invoices relating to the payments taken out of their bank.
The invoices will detail the expense items and the vat applicable as some items are not vatable.
For receipts into the bank from these companies this will be the sales amounts taken through the card machine.
Hope this helps with your query.