This API takes ownership of the given approval request. This API accepts process definition ID, list of request IDs, user ID and ID of the context object as request parameters. 

Request Parameters
processDefnIdIDYesID of the process definition.
requestIdListSet<ID>YesSet of request identifiers.

ID of the requesting owner.

ctxObjectIdIDYesID of the business context object.
Response Parameter
resultBooleanThe API returns a true value upon successful execution of the API.