For me, it’s Subscription Management.
The complexity of handling payments is overwhelming. My service operates on a monthly fee with a free trial period. You can add a domain name or other features at the start. So, the payment process involves a one-time charge today and setting up a recurring monthly payment starting in 14 days. And then there are emails—emails everywhere.
In the customer account portal, there are updates for card information, past invoice listings, and more emails.
On the admin side, there are updates for call-ins, alerts for missed or denied payments, automated processes for missed payment cancellations, and even more emails.
It’s just crazy—so much code, extensive tokenization, and JSON encoding/decoding.
Which part of your app was the most challenging to handle in your code base?