Artikel 25

1. Accounting rules
1.1. Designated operators shall comply with the accounting rules defined in the Regulations.
2. Preparation of monthly and general accounts
2.1. The paying designated operator shall prepare for each issuing designated operator a monthly account showing the sums paid for postal payment orders. The monthly accounts shall be incorporated, at the same intervals, in a general offset account including instalments and giving rise to a balance.
3. Instalment
3.1. In case of an imbalance in exchanges between designated operators, an instalment shall be paid by the issuing designated operator to the paying designated operator, at least once a month, at the beginning of the settlement period. In cases where increasing the frequency of settlement of exchanges reduces the period to less than a week, operators can agree to waive this instalment.
3.2. (Deleted.)
4. Concentration account
4.1. In principle, each designated operator shall have one concentration account for users’ funds. These funds shall be used solely for settling postal payments paid to the payees or for reimbursing non-executed postal payment orders to senders.
4.2. Any instalments paid by the issuing designated operator shall be credited to the concentration account for the paying designated operator. These instalments shall be used exclusively for payments to payees.
5. Security deposit
5.1. The payment of a security deposit may be required in accordance with the conditions provided for in the Regulations.