Which is the best payments solution?

Hi Folks,

What is the best payments solution for Micro SaaS apps?

Following are some of the requirements that I can think of now. But based on your personal experience with payments from your SaaS apps, can you share a few best options?

• Handle subscriptions
• Handle discount coupons
• Handle notifications
• Handle invoices
• Easy to integrate with our App
• and so on...

Also, do you charge at the beginning of the month or at the end of the month for subscriptions?