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

1. (a)

   when establishing a business relationship;

2. (b)

   when carrying out an occasional transaction that:

   1. (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

   2. (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 Council31, exceeding EUR 1 000;
3. (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;

4. (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;

5. (e)

   when there is a suspicion of money laundering or terrorist financing, regardless of any derogation, exemption or threshold;

6. (f)

   when there are doubts about the veracity or adequacy of previously obtained customer identification data.