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 (^{12}),(^{13}), 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;
(e)when there is a suspicion of money laundering or terrorist financing, regardless of any derogation, exemption or threshold;
(f)when there are doubts about the veracity or adequacy of previously obtained customer identification data.