code: func (r Product_Upgrade_Request) ApproveChanges() (resp bool, err error) {
  	err = r.Session.DoRequest("SoftLayer_Product_Upgrade_Request", "approveChanges", nil, &r.Options, &resp)
  	return
  }
docs: // When a change is made to an upgrade by Sales, this method will approve the changes that were made. A customer must acknowledge the change and approve it so that the upgrade request can proceed.