How to process recurring payments/donations?
I am a volunteer at an NGO and I want to implement Odoo 10 to them for free. Currently I can process donations via webshop (I "simulate" them as services) and it is possible to pay with credit cards and paypal. However one of the problems the NGO has is exactly that it is hard to rely on "once" donations and they would like to be able to offer recurrent donations / subscriptions / contracts (I am not sure the right terminology for this on Odoo).
I have seen some threads and resources  about this but they look quite outdated and I couldn't follow them since I cannot find the menu items they reference.
Looking at the configuration under: Sales | Configuration | Settings | Subscriptions it seems to be an Enterprise feature , so I am not sure that it is even possible to achieve what I would like. It is quite confusing that this features seems that was available before but now it is not available anymore.
Are you aware of a way to achieve this functionality without going with Odoo Enterprise? If not, would it be available with an OCA module or something similar?
Thank you very much!