how to use rest api to create extension api

Hi:

I have one extension api, i upload it form web/resource/REST API, affter upload, it works well. however, I used the code to upload, i used the PageAPI.createPage() to upload extension, it upload success, but it doesn' work, i check the file on server, from the server, i can't find the extension from the ${BONITA_HOME}\bonita\client\tenants\1\work, it only exist on ${BONITA_HOME}\bonita\client\tenants\1\temp, debug, the files is invode the pageAPI servlet, and invode the PageDataStore.createEngieenPage(), so my question is how can i ues the REST API to add extension and deploy it?