So I'm looking to have max_installments be a variable based on the current date and, say, a deadline for funds to get to the site. So currently in the donation page template, I have:

<label for="num_installments" class="padbottomless">I want to pay this in <select id='install'></select> installments</label>

where select is a dropdown menu that has a number of options depending on the variable.

Is there a way to make this work through the payment system? How does the

{% collection_select "num_installments", page.donation.installment_collection, class:"select" %} 

work through NationBuilder? Currently "allow installments" is unchecked because of we want to customize the max.