I have already created a website using MEAN.
Once a user is registered, I want to propose a free trial for 15 days, and a paying plan (eg, $5/month). I want to implement this mechanism, including the paying page.
Does anyone know a fitting payment API that easily integrates with my setup (ie. it is easy to implement in my website)? As I haven't yet decided on a specific payment system/provider, this is secondary at the moment (should have reasonable conditions, though).