"Account type" should have values like "CHECKING", "CREDIT CARD", "SAVINGS" identifying the account type and should be supplied for all transactions.
"Account name" should have values like "My Bank account" or any other label. Also please have the column "Account ID" with the account name for all transactions.
"Type" should have values like "DEBIT" or "CREDIT" to identify the transaction type. If the amount column has negative values for debits and positive for credits, this field is redundant, but can be also used.