TransferReceivers are external accounts that a Lender can create and use for requesting withdrawals. The BFS API only supports GetTransferReceivers right now but CreateTransferReceivers will be released shortly. To create TransferReceivers the BFS Back Office GUI can be accessed as a backup.
Transactions are called BusinessTransactions in BFS and methods exists for creating and getting BusinessTransactions. BusinessTransactions can be created in two dimensions, Trade and Settle which has to be understood before using these methods. The Bricknode Knowledge base can be consulted for further information about this or an educational request through our service desk.