Abstract: A method of providing an installment loan, comprising: sending a request for a loan of a specific sum by a purchaser holding proprietary payment means to an installment payment system, said purchaser at a POS; calculating by said installment payment system a credit score for said purchaser; determining by said installment payment system individual loan sum Y0 and terms of payment for said purchaser using said calculated credit score; reserving said sum of Y0 for said loan; purchasing goods from a merchant at said POS in a sum X?Y0 by said purchaser; paying said merchant the full purchase sum X by said installment payment system; and optionally performing a further purchase according to said individual terms of payment.