相手の確認って英語でなんて言うの？

identify=「相手が、〇〇であると確認する。」 その名詞形＝identification これでお役に立てば幸いです。 感謝

The meaning of "相手” is : other party, other person, the other side etc. and "確認”　means "confirmation", "verification", etc. The above question means the other person's consent and that other person could be anybody like customer, your partner, business client etc.