It has been arranged so that the customer pays with a separate account
It was decided that the customer pay with a separate account
〜ことになった --> it has been arranged/it was decided
支払う--> pay
別のアカウント--> separate account
"X"にしてもらう”は英語で"X"が行動をします。
纏めは
"It has been arranged so that the customer pays with a separate account"
アメリカ合衆国 
