evidence: 2. The competent authority may permit or prescribe the payment of wages by bank cheque or postal cheque or money order in cases in which payment in this manner is customary or is necessary because of special circumstances, or where a collective agreement or arbitration award so provides, or, where not so provided, with the consent of the worker concerned. [...] Wages shall be paid directly to the worker concerned except as may be otherwise provided by national laws or regulations, collective agreement or arbitration award or where the worker concerned has agreed to the contrary. [...] Where necessary, effective measures shall be taken to ensure that workers are informed, in an appropriate and easily understandable manner-- (a) before they enter employment and when any changes take place, of the conditions in respect of wages under which they are employed; and (b) at the time of each payment of wages, of the particulars of their wages for the pay period concerned, in so far as such particulars may be subject to change.