55It follows that the notion of ‘seller or supplier’, within the meaning of Article 2(c) of Directive 93/13 is a functional concept, requiring determination of whether the contractual relationship is amongst the activities that a person provides in the course of their trade, business or profession (see, by analogy, the order of 27 April 2017, Bachman, C‑535/16, not published, EU:C:2017:321, paragraph 36 and the case-law cited).
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