Calling COBOL apibs on AS400

Hello, we need to integrate to an application an an AS400. The application is called Image Plus Workfolder Application Facility (WAF) from IBM. There are API’s available that we would like to use but they are written in COBOL. Does anyone have any knowledge/experience calling COBOL api’s via webMethods adapters ? My guess is that this can be done by wrapping the COBOL api’s with Java, or C/C++.
We are trying to avoid interacting directly with the WAF application ( DB2 UDB ) on the AS400.

Any advice ?