use SQL RETURNING to keep Go object up to date after actions. Lots of the actual file is omitted, the important stuff is here.

payment.go

type Payment struct {
	ID          string
	Amount      uint64
	Name        string
	Description string
	Email       string
	Status      PaymentStatus

	StripeTokenID  string
	StripeChargeID string

	CreatedAt time.Time
	UpdatedAt time.Time
}

func (p *Payment) ChargeToken(tok string) error {
	p.StripeTokenID = tok
	defer p.Save()

	chargeParams := &stripe.ChargeParams{
		Amount:   p.Amount,
		Currency: "usd",
		Desc:     p.Description,
	}
	chargeParams.AddMeta("paymentID", p.ID)
	chargeParams.Params.IdempotencyKey = p.ID
	chargeParams.SetSource(p.StripeTokenID)

	ch, err := charge.New(chargeParams)
	if err != nil {
		p.Status = PaymentStatusError
		return err
	}

	p.StripeChargeID = ch.ID
	p.Status = PaymentStatusPaid

	return nil
}

func (p *Payment) Save() error {
	if p.ID == "" {
		return p.insert()
	}
	return p.update()
}

func (p *Payment) update() error {
	q := `
	UPDATE payment SET
		name = $2,
		description = $3,
		amount = $4,
		email = $5,
		status = $6,
		stripe_token_id = $7,
		stripe_charge_id = $8
	WHERE id = $1
	RETURNING
		name, description, amount, email, status, stripe_token_id,
		stripe_charge_id, created_at, updated_at
	`
	err := db.QueryRow(q,
		p.ID,
		p.Name,
		p.Description,
		p.Amount,
		p.Email,
		p.Status,
		p.StripeTokenID,
		p.StripeChargeID,
	).Scan(
		&p.Name,
		&p.Description,
		&p.Amount,
		&p.Email,
		&p.Status,
		&p.StripeTokenID,
		&p.StripeChargeID,
		&p.CreatedAt,
		&p.UpdatedAt,
	)
	switch {
	case err == sql.ErrNoRows:
		return errors.New("payment: could not update")
	case err != nil:
		return err
	}
	return nil
}

func (p *Payment) insert() error {
	q := `
	INSERT INTO payment
		(name, description, amount, email)
	VALUES
		($1, $2, $3, $4)
	RETURNING
		id, created_at, updated_at
	`
	err := db.QueryRow(q,
		p.Name,
		p.Description,
		p.Amount,
		p.Email,
	).Scan(
		&p.ID,
		&p.CreatedAt,
		&p.UpdatedAt,
	)
	switch {
	case err == sql.ErrNoRows:
		return errors.New("payment: insert did not return an object")
	case err != nil:
		return err
	}

	return nil
}