Work with rest api

I'm looking an real expert, php language , having real knowledge relating rest api. This guy must be confident with linux, mysql,php. So I'll consider only people able to solving immediately, a problem ( consider it like a test). 1 go to [login to view URL] 1 look for. ---> Create a contacts group I have created more groups giving only name and description (the id_group will be created automatically ) 2 look for --->List contacts groups (php language) When I execute it , only few groups appear ( see attached file). So if you are real expert, I want to know : relating point n. 1 - Explain how retrieve the id_group created ,when a new group is inserted (modify php code) relating point .n 2 Explain how is possible show all group (modify php code) Sorry by the way, but I have had bad experience in the past. I need a real expert, not people who improvise