How to find a standard abap proxy?

Hello,dear all

We are integrating SAP POSDM and third party system with XI, the data flow is 3-rd party --> XI --> POSDM.The third party system will send a xml file to XI,XI convert it and send it to POSDM using IDoc. Idoc type is WPUBON,the process code is WPUB and the fuction module is /POSDW/IDOC_INPUT_WPUBON.

Now we want to use ABAP proxy to send data to POSDM instead of IDoc. Do SAP system have the standard abap proxy to process the POS sales data like WPUBON Idoc? And how to use it?

Appreciate for your answer!

Many thanks,

Jerry