Member States shall ensure that obliged entities apply customer due diligence measures in the following circumstances:

(a) when establishing a business relationship;

(b) when carrying out an occasional transaction that:

(i) amounts to EUR 15 000 or more, whether that transaction is carried out in a single operation or in several operations which appear to be linked; or

(ii) constitutes a transfer of funds, as defined in point (9) of Article 3 of Regulation (EU) 2015/847 of the European Parliament and of the Council [Regulation (EU) 2015/847 of the European Parliament and of the Council of 20 May 2015 on information accompanying transfers of funds and repealing Regulation (EC) No 1781/2006 (see page 1 of this Official Journal).], exceeding EUR 1 000;

(c) in the case of persons trading in goods, when carrying out occasional transactions in cash amounting to EUR 10 000 or more, whether the transaction is carried out in a single operation or in several operations which appear to be linked;

(d) for providers of gambling services, upon the collection of winnings, the wagering of a stake, or both, when carrying out transactions amounting to EUR 2 000 or more, whether the transaction is carried out in a single operation or in several operations which appear to be linked;