Ho trovato la soluzione qui
<insert id="savePayments">
INSERT ALL
<foreach collection="payments" item="payment">
INTO
mass_payments_t (payment_id, file_id, msisdn, amount)
VALUES
(seq_mass_payment.nextval, #{payment.fileId, javaType=Integer, jdbcType=NUMERIC}, #{payment.msisdn, javaType=String, jdbcType=VARCHAR}, #{payment.amount, javaType=BigDecimal, jdbcType=NUMERIC})
</foreach>
SELECT * FROM dual
</insert>