code: func (c *Client) AppTransferUpdate(appTransferIdentity string, state string) (*AppTransfer, error) {
  	params := struct {
  		State string `json:"state"`
  	}{
  		State: state,
  	}
  	var appTransferRes AppTransfer
  	return &appTransferRes, c.Patch(&appTransferRes, "/account/app-transfers/"+appTransferIdentity, params)
  }
docs: // Update an existing app transfer.
  //
  // appTransferIdentity is the unique identifier of the AppTransfer. state is the
  // the current state of an app transfer.