prestashop通过url webservice api创建和更新资源

I (unfortunately) have to write a client application as front end to a prestashop powered web site. I'd need to perform all CRUD operations on resources via url webservice and I'm stuck on create and update. I was very surprise to find out how few examples are available on the web since prestashop is supposed to be a widely used cms. However, till now I came to:I (unfortunately) have to write a client applic