Hi,
We do not need to handle the 3 month subscription. But, during the checkout, we need to charge the customer for either 1/3 of the order amount if they select the 3-pay or we need to bill them for the entire order amount if they select the single pay.
Note that you can :
- Use a "Type of payment" characteristic so that your customers will be able to choose if they want to buy the product in one time of just through the 3 month subscription
In this case, if a customer buys product x, they can pay for the entire order in 3 monthly payments with no interest.
Note that you can use different payment methods regarding the products that are in your cart, but not change the price of the product in it.