I currently have a custom function on the ws_plugin__s2member_pro_before_sc_paypal_form hook that modifies the EOT for all new registrations so that they all expire on a fixed date. That works great.
However, I need to do the same when membership type is changed via billing modification form – but I can’t figure out where I can hook that function. The modification process doesn’t call the ws_plugin__s2member_pro_before_sc_paypal_form hook.
I’ve tried ws_plugin__s2member_pro_during_sc_paypal_modification_form but that doesn’t seem to work. I found this topic What to Hook Into to Update a non-s2Member Custom Field on a Billing Modification Form Template? but that doesn’t seem to have a resolution.