txn.Begin

This method is supported by POA starting from version 2.6.3.

This method begins the transaction. Use the txn.Commit method to commit the transaction or use the txn.Rollback method to rollback the transaction.

The method has the following input parameters:

Name	Type	Short Description
`[txn_id]`	string	Transaction ID. This is optional parameter. If it is omitted, parameter is generated by POA.
`[timeout]`	int	Defines transaction timeout (in seconds). This is optional parameter. Timeout is unlimited by default.
`[request_id]`	string	Request ID. It is used to track the overall status of tasks scheduled by the transaction, if specified. Use the pem.getRequestStatus method to obtain the overall status of tasks scheduled after transaction commit.

The method has the following output parameters:

Name	Type	Short Description
`txn_id`	string	Transaction ID.