Get details of a transaction
getTxnDetails( responseBack, customerId, maxRecords, paymentInstrumentId )
| Name | Type | Description |
| responseBack | Indicates which function to be called when a response is received. | |
| customerId | The customer id of the user | |
| maxRecords | The max number of transactions to return | |
| paymentInstrumentId | The id of the payment instrument |