The payment form automatically recognizes cards that are eligible for installment payments. The specific installment range and terms will be defined by your merchant-acquirer agreement.
Force Installments
To mandate that a payment be made with installments, use the force_installments option.
Supported values for this parameter are boolean true and string 'true'. If false is provided, or if the parameter is omitted, it will default to false.
When this option is enabled, the buyer is required to select one of the available installment options and is unable to make a single, one-off payment.
Forcing installments will only function if installments are already enabled on your merchant profile. Attempting to force installment payments for a merchant setup where installments are not enabled will result in an error.