coinbase.go
func (c Client) CreateOrderFromButtonCode(buttonCode string) (*order, error) {
	holder := orderHolder{}
	if err := c.Post("buttons/"+buttonCode+"/create_order", nil, &holder); err != nil {
		return nil, err
	}
	if err := checkApiErrors(holder.response, "CreateOrderFromButtonCode"); err != nil {
		return nil, err
	}
	return &holder.Order, nil
}
func (c Client) CreateOrderFromButtonCode(buttonCode string) (*order, error) {
	holder := orderHolder{}
	if err := c.Post("buttons/"+buttonCode+"/create_order", nil, &holder); err != nil {
		return nil, err
	}
	if err := checkApiErrors(holder.response, "CreateOrderFromButtonCode"); err != nil {
		return nil, err
	}
	return &holder.Order, nil
}
// CreateOrderFromButtonCode creates an order for a given button code