Is it possible to oreder vps with ovh api

i managed to post vps order in my cart , after assigning it to logged client , but when i get to the part to validate and create order i get this error,
Bad Request (400)
{ "message": "Custom field vps_ssd_datacenter is mandatory for product ssd_model1_2018v1\nCustom field vps_ssd_os is mandatory for product ssd_model1_2018v1" }

And i tried to use setup up configuration item , but still i get this error ,

Bad Request (400)
{ "message": "Custom field vps_ssd_model1_internal not found in product ssd-model1-internal" }

is it possible to order vps with this api ?