post https://api-sandbox.y.uno/v1/installments-plans
Merchants Installments
This endpoint is only required for Merchant installments integration For Provider defined installments, we use the installment plan define by your payment provider.
For merchant-created installments, you also have the possibility of specifying the plan for every checkout session by using the plan_id
while creating the session. If you do not send it, we will use the installment plan that matches the conditions set for the checkout session.