Hello,
(You can post in French in that forum section if you want ; best is to add the tag [FR] in the topic name so other users will know).
Yes HikaSubscription allows you to sell subscriptions with different durations (x days, x months, x years).
If you want to let you custom choose the duration, the ideal solution is to create an HikaShop product with variants (each variant will have a link to the same subscription but with a different duration).
Regarding the shipping fee, it's related to HikaShop so it would be best that the HikaShop support team answer you (please open a new forum thread in the HikaShop section).
But regarding HikaSubscription and the recurring, if you enable a setting to not sell subscriptions and regular products in the same time ; HikaSubscription will use the entire order for the recurring, which means it will also use the shipping fee in the recurring price.
We have two payment methods which have recurring support.
ClicAndPay API seems compatible with the HikaShop recurring system but the plugin provided by Lyra Network is not using that specific API.
So it would require a custom development in order to create such compatible plugin.
Regards,