coinbase.go
func (c Client) GetTransaction(id string) (*transaction, error) {
	holder := transactionHolder{}
	if err := c.Get("transactions/"+id, nil, &holder); err != nil {
		return nil, err
	}
	if err := checkApiErrors(holder.response, "GetTransaction"); err != nil {
		return nil, err
	}
	return &holder.Transaction, nil
}
func (c Client) GetTransaction(id string) (*transaction, error) {
	holder := transactionHolder{}
	if err := c.Get("transactions/"+id, nil, &holder); err != nil {
		return nil, err
	}
	if err := checkApiErrors(holder.response, "GetTransaction"); err != nil {
		return nil, err
	}
	return &holder.Transaction, nil
}
// GetTransaction gets a particular transaction referenced by id