You need to specify Top Object, object and property to delete. Warning, property names are not unique across object, parameter pr_name will delete first property with that name, use pr_id to be sure which property to delete

required parameters
(ob_top_id or ob_top_name) to specify Top Object and (ob_id or ob_name) to specify child object and (pr_name or pr_id) to specify property.
optional parameters
response format
pr_id – deleted property id
parameter reference

ob_top_id – Top Object id, unique

ob_top_name – Top Object name, not unique

ob_id – object id, unique

ob_name – object name, unique across Top Object

pr_id – property id, unique

pr_name – property name, not unique