I.5.2  Interim payment  I.5.3  Payment of the balance  1. The contractor (or leader in the case of a joint tender) may claim an interim payment equal to 40 %  of the price referred to in Article I.4.1 in accordance with Article II.21.6. The contractor must send an invoice via e-mail in PDF format or via  e-PRIOR  for the interim payment  as provided for in the tender specifications, accompanied by the following:  The template declaration is provided in Annex III of this contract.  2. The contracting authority must approve any submitted documents or deliverables and pay within  60 days from receipt of the invoice. 3. The contracting authority may suspend the time limit for payment specified in point 2 in accordance  with Article II.21.7. Once the suspension is lifted, the contracting authority shall give its approval and  pay within the remainder of the time-limit indicated in point (2) unless it rejects partially or fully the  submitted documents or deliverables.  1. The contractor (or leader in the case of a joint tender) may claim the payment of the balance in  accordance with Article II.21.6.  The contractor (or leader in the case of a joint tender) must send an invoice via e-mail in PDF format  or via  e-PRIOR for payment of the balance due under the contract, as provided for in the tender  specifications and accompanied by the following: The template declaration is provided in Annex III of this contract.  a) a list of all pre-existing rights incorporated into the results or parts of the results for all  deliverables or a declaration stating that there are no such pre-existing rights, as provided for  in Article II.13.4; Contractors must submit a declaration stating clearly if any materials  incorporated into the deliverables are subject to pre-existing rights. The contractor must  explicitly declare which pre-existing rights are contained within the deliverables and must  warrant that those materials are free of rights or claims from creators or from any third parties  for any use the Contracting Authority has foreseen in art.I.10 of the contract. Absence of such  declaration when the deliverable and invoice is received will be understood by the Contracting  Authority as confirmation that there are no pre-existing rights within the deliverables and the  Contracting Authority will proceed with the payment.  b) All other deliverables listed in section 1.3 of the tender specifications.  b) deliverable no.3, i.e. interim report no. 2 due 4 months from the kick-off meeting. a) a list of all  pre-existing rights  incorporated into the  results  or parts of the results for interim  deliverables or a declaration stating that there are no such pre-existing rights, as provided for  in Article II.13.4; Contractors must submit a declaration stating clearly if any materials  incorporated into the interim deliverables are subject to pre-existing rights. The contractor  must explicitly declare which pre-existing rights are contained within the deliverables and must  warrant that those materials are free of rights or claims from creators or from any third parties  for any use the Contracting Authority has foreseen in art.I.10 of the contract. Absence of such  declaration when the deliverable and invoice is received will be understood by the Contracting  Authority as confirmation that there are no pre-existing rights within the deliverables and the  Contracting Authority will proceed with the payment.  6 