It seems that iCheque doesn’t support chunked transfer in their new version of payment API, but chunked transfer is enabled in AXIS2 by default, so you will get
org.apache.axis2.AxisFault: Transport error: 411 Error: Length Required
When chunked transfer is enabled, the Content-Length will not be present in the HTTP header of request. Because by using chunked transfer, the sender can dynamically generate the content, and send it, the sender doesn’t need to know the length of the content. Another HTTP header, Transfer-Encoding: chunked, will be put in.
If the receiver doesn’t support chunked transfer, you have to disable it.
In AXIS2, you can disable it like this