...
"use": "true",
"vynil": { "id": 32, "basem2":0.2, "basePrice":17, "step": 1.41 },
"camvas": { "id": 34, "basem2":0.2, "basePrice":22, "step": 1.28 },
"phototex": { "id": 33, "basem2":0.2, "basePrice":25, "step": 1.67 },
"material_group": {"id": "group_5"},
"surface_group": {"id": 6}
},
3.3 Ajoutez vos couleurs !
...