Contract number: ECHA/2020/724  Restricted  Service contract conditions of December 2018  (c) the daily subsistence allowance takes the form of a flat-rate payment to cover all  subsistence expenses, including meals, local transport including transport to and from  the airport or station, insurance and sundries;  (d) the daily subsistence allowance is reimbursed at the flat rates specified in Article I.4.3;  (e) accommodation is reimbursed on receipt of supporting documents proving the  necessary overnight stay at the destination, up to the flat-rate ceilings specified in  Article I.4.3. II.22.5  The contracting authority reimburses the cost of shipment of equipment or  unaccompanied luggage if it has given prior written approval for the expense.  II.23.1  If an amount is to be recovered under the terms of the contract, the contractor  must repay the contracting authority the amount in question.  (a) by offsetting them against any amounts owed to the contractor by the Agency or by the  European Atomic Energy Community or by an executive agency when it implements  the Agency budget; (b) by calling in a financial guarantee if the contractor has submitted one to the contracting  authority; (c) by taking legal action. Before recovery, the contracting authority must  formally notify  the contractor of its intention to  recover the amount it claims, specifying the amount due and the reasons for recovery and  inviting the contractor to make any observations within 30 days of receipt.  If no observations have been submitted or if, despite the observations submitted, the contracting  authority decides to pursue the recovery procedure, it must confirm recovery by  formally  notifying  a debit note to the contractor, specifying the date of payment. The contractor must  pay in accordance with the provisions specified in the debit note.  If the contractor does not pay by the due date, the contracting authority may, after informing  the contractor in writing, recover the amounts due:  If the contractor does not honour the obligation to pay the amount due by the date set by the  contracting authority in the debit note, the amount due bears interest at the rate indicated in  Article II.21.8. Interest on late payments will cover the period starting on the day after the due  date for payment and ending on the date when the contracting authority receives the full amount  owed. Any partial payment is first entered against charges and interest on late payment and then  against the principal amount.  If the contract is signed by a group (joint tender), the group is jointly and severally liable under  the conditions set out in Article II.6 (liability). The contracting authority shall send the debit note  first to the leader of the group. If the leader does not pay by the due date the whole amount, and if the amount due cannot be  offset or can only be offset partially in accordance with Article II.23.2 (a), then the contracting  authority may claim the amount still due to any other member or members of the group by  respectively  notifying them with a debit note in conformity with the provisions laid down in  Article II.23.2. 31  II.23.4. Recovery rules in the case of joint tender  II.23.3. Interest on late payment  II.23.2. Recovery procedure  II.23. RECOVERY 