Calculations​
Calculation of monthly cost for account.​
You can use the following algorithm to calculate the products part payment cost (in the end customers native currency):
(Product cost / Number of months) + (Product cost * Interest rate) + Monthly fee
For example: A product worth 9,95 € , divided on 12 months, an interest rate of 1,6583 %, and a monthly fee of 3,00 € would give the algorithm:
(9,95 / 12) + (9,95 * 1,6583 %) + 3,00 = 4,00 € per month
(The actual lowest amount to pay in the example would be 4,00 € per month, but the lowest accepted payment is 5 €)
Calculating monthly cost to display on the checkout page​
The same algorithm can be applied on the checkout page, but the two occurrences of product cost needs to be replaced by the total purchase amount including shipping fee:
(Total purchase amount / Number of months) + (Total purchase amount * Interest rate) + Monthly fee
For example: The customer orders two products, each worth 19,90 € and a shipping fee of 5,95 € is added. This algorithm would then apply:
(45,75 / 12) + (45,75 * 1,6583 %) + 3,00 = 7,58 € per month
Please note that the amount to pay per month should be rounded up to the nearest integer, and the lowest amount is always 5 €.
Calculation of monthly cost for annuity payment​
The formula used to calculate the cost is the following:
CapitalDebt * (MonthlyInterestRate / ((1 + MonthlyInterestRate) ^ Months - 1)) + CapitalDebt * MonthlyInterestRate + InvoiceFee
Here's an example: if the total basket value is 321,8€, it gives the following:
321,8 * (1,6583% / ((1 + 1,6583%) ^ 24 - 1)) + 321,8 * 1,6583% +3,00 = 19,37€ per month
Please note that the amount to pay per month should be rounded up to the nearest integer, and the lowest amount is always 5 €.