PAYMENT ARRANGEMENTS 4.1 A pre-financing payment shall be made to the participant no later than (whichever comes first): 30 calendar days after the signature of the agreement by both parties the start date of the mobility period [optional: or upon receipt of confirmation of arrival by the beneficiary] representing [between 70% and 100%] of the amount specified in Article 3. In case the participant did not provide the supporting documents in time, according to the sending institution's timeline, a later payment of the pre-financing can be exceptionally accepted. 4.2 If the payment under article 4.1 is lower than 100% of the financial support, the submission of the online EU survey shall be considered as the participant's request for payment of the balance of the financial support. The institution shall have 45 calendar days to make the balance payment or to issue a recovery order in case a reimbursement is due.