25According to the Court’s case-law, it is clear from the usual legal meaning of ‘for pecuniary interest’ that those terms designate a contract under which each of the parties undertakes to provide one form of consideration in exchange for another (see, to that effect, judgment of 18 October 2018, IBA Molecular Italy, C‑606/17, EU:C:2018:843, paragraph 28). The synallagmatic nature of the contract is thus an essential element of a public contract (see, to that effect, judgments of 21 December 2016, Remondis, C‑51/15, EU:C:2016:985, paragraph 43; of 28 May 2020, Informatikgesellschaft für Software-Entwicklung, C‑796/18, EU:C:2020:395, paragraph 40; and of 18 June 2020, Porin kaupunki, C‑328/19, EU:C:2020:483, paragraph 47).
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