this service call transfer funds from one internal account to another customer own account.
fundTransfer( responseBack, fromAccount, toAccount, amount, msg )
| Name | Type | Description |
| responseBack | callback handler | |
| fromAccount | {Account} object that contains source account details | |
| toAccount | {Account} object that contains target account details | |
| amount | {Amount} object that contains value and currency | |
| msg | {String} optional message |