Pay in several installments

[tearslake]

I need to provide a client an option to pay in several instalments. Is it possible to do in WP EasyCart?
For example, the order total is $9450, the client either pays the full sum immediately or chooses to pay 1/3 deposit immediately and 2/3 in several instalments: in 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 instalments.
How do I implement it with WP EasyCart PRO?

[tearslake]

Upon further investigation I figured that there are two options: either enable Klarna on checkout or use subscription product option in EasyCart.
I've tried Klarna and it didn't work: I've enabled it on Stripe side but there is no such option in EasyCart.
I've tried using subscription but it does not allow me to indicate billing cycle start and number of payments. These options just don't exist inside the EasyCart settings.
Any suggestions?