Synonyms for «additional confirmation»

extra necessary positive subsequent confirmatory second multiple alternative important alternate ample certain official experimental unconfirmed continued strong great related new similar specific final possible public third little helpful written several contact significant relevant financial quick much instant good full initial price conclusive customer sufficient double supportive acceptable medical affirmative

verification proof approval confidence validation assurance affirmation evidence testing certainty check clarification reassurance details information email registration reminder accuracy booking review support documentation acknowledgement answer payment security addition request claims reservation identity doubt appointment fact statement questions message transactions corrections availability reinforcements order explanation screening notice help date signing