I mean the Installment, PayLaterMonths, PayNumberMonths, InstallmentType AlphaHPP parameters, which are documented in the «AlphaHPP» → «Paypage Request Reference» → «Request a Paypage Session» table:

I mean the Installment, PayLaterMonths, PayNumberMonths, InstallmentType AlphaHPP parameters, which are documented in the «AlphaHPP» → «Paypage Request Reference» → «Request a Paypage Session» table:

I have got a response from the AlphaCommerceHub support:
This feature won’t be used for the Magento module.
It is used for setting up scheduled payments with certain providers.