Article 18 Commencement order Article 19 Period of implementation of the tasks  18.1  The contracting authority shall inform the contractor by administrative order of  the date on which implementation of the tasks shall begin.  19.1 For Lot 1: The implementation period will last 255 calendar days, starting from  the date of the signature of the contract by both parties and ending on the day of  issuance of the certificate of Provisional Acceptance. The implementation  period will include delivery period of 180 calendar days, installation,  commissioning and training period of 30 days after delivery, issuance of  Provisional Acceptance period of 45 days after completion of all services.  For Lot 2: The implementation period will last 345 calendar days, starting from  the date of the signature of the contract by both parties and ending on the day of  issuance of the certificate of Provisional Acceptance. The implementation  period will include delivery period of 270 calendar days, installation,  commissioning and training period of 30 days after delivery, issuance of  Provisional Acceptance period of 45 days after completion of all services.  For Lot 3: The implementation period will last 205 calendar days, starting from  the date of the signature of the contract by both parties and ending on the day of  issuance of the certificate of Provisional Acceptance. The implementation  period will include delivery period of 130 calendar days, installation,  commissioning and training period of 30 days after delivery, issuance of  Provisional Acceptance period of 45 days after completion of all services.  For Lot 4: The implementation period will last 165 calendar days, starting from  the date of the signature of the contract by both parties and ending on the day of  issuance of the certificate of Provisional Acceptance. The implementation  period will include delivery period of 90 calendar days, installation,  commissioning and training period of 30 days after delivery, issuance of  Provisional Acceptance period of 45 days after completion of all services. Article 26 General principles for payments  26.1  Payments shall be made in euros.  26.3  By derogation, the final payment to the contractor of the amounts due shall be  made within 90 days after receipt by the contracting authority of an invoice and  of the application for the certificate of provisional acceptance.  26.5  In order to obtain payments, the contractor must forward to the authority  referred to in paragraph 26.1 above:  a) For the 40% pre-financing, the pre-financing guarantee. b) For the 60 % balance, the invoice(s) in triplicate together with the request  for provisional acceptance of the supplies.  August 2020 c4d_specialconditions_en.doc  Page 4 of 7  Payments shall be authorised and made by Ministry of Industry and Technology  - DG for EU and Foreign Affairs - Directorate of EU Financial Programmes  (MoIT-DoEUFP), Mustafa Kemal Mahallesi, Dumlupınar Bulvarı, (Eskişehir  Yolu 7. Km), 2151.Cadde, No:154/A, Kat:7, 06510 Çankaya/Ankara, Turkey. 